Analog Dialogue Current Issue

Product Index

ADCs and DACs, R-DAC, Audio Playback
Amplifiers, Mux, Reference, DC-DC
Power Management, Supervisory Circuits
Temp Sensor, Codec, Communications & ATE ICs

ADCs and DACs, R-DAC, Audio Playback

10-Bit, 100-MSPS A/D

AD9070 has 230 MHz BW SOIC-28, low power-600 mW

The AD9070 is a 10-bit, 100-MSPS A/D converter with parallel-output and ECL digital interfaces. Housed in a tiny SOIC-28 package, and dissipating only 600 mW, it has an analog bandwidth of 230 MHz-a useful feature for sub-Nyquist direct IF sampling in communications systems. Use it in point-to-point or cellular communication, satellite applications, HDTV, and digital scopes.

The AD9070 has differential analog inputs with a 1-V p-p range. It operates on a single +5-V or -5-V supply and uses a differential clock. Typical signal-to-noise-and-distortion (SINAD) is 54 dB with a 41-MHz analog input. The AD9070BR, housed in a 28-lead SOIC, uses either an external or a 2.5-V on-chip reference and is specified for operation from -40 to +85°C. A full MIL version is also available. Price (BR) in 1000s is $68.

- Analog Front End

24-bit AD7730 has low noise, low offset and low gain drift

The AD7730 is a complete 24-bit low-noise analog front end for digitizing low-frequency signals, usually from ac or dc bridge-type transducers such as those used in weigh scales. It has a pair of multiplexed buffered differential inputs, can accept low-level signals directly from the transducer; and it outputs a serial digital word. Chopper circuitry and a programmable-gain amplifier (PGA) provide a wide dynamic range and low drift of offset (5 nV/°C) and gain (2 ppm/°C). An internal 6-bit DAC provides offset to null out weigh-scale tare weight.

The device's digital filter is programmable, and a FASTStep™ mode speeds up response to step changes. The AD7730 can operate from a single +5-V supply, and with a reference voltage that can equal the supply. It is available in 24-pin plastic DIP, SO, and TSSOP for the -40 to +85°C range. Price in 1000s is $9.86.

Single, Dual 8-Bit D/A

AD7801, AD7302 available in TSSOP-20; Rail-to-rail output

The AD7801 and AD7302 are single and dual versions of a single-supply D/A converter with parallel interface. They can operate with supply voltages from 2.7 to 5.5 V, and their on-chip output amplifiers swing rail-to-rail. Worst-case power requirement, over temperature, is 2.5 mA max per channel, and full power-down is 1 µA max (2 µA max over temperature).

They can operate with internal or external voltage references. Their parallel digital interface is µP- and DSP-compatible, with double-buffered high-speed registers. An asynchronous CLR input can reset the outputs. Both devices operate from -40 to +105°C; they are available in 20-lead SO and TSSOP, and the AD7302 is also available in a 20-pin DIP. Price in 1000s, any package, is $1.80 for AD7801 and $2.00 for AD7302.

10-Bit, 20-MSPS ADC

AD9200 operates with 2.7 to 5.5-V supplies, 100 mW max

The AD9200 is a monolithic 10-bit, 20- MSPS A/D converter in CMOS with low power consumption (80 mW on a 3-V supply- 5 mW in sleep mode) and wide bandwidth (300 MHz full power). It operates on single-supply voltages from 2.7 to 5.5 V. The input has been designed to ease the development of imaging and communications systems, with a variety of input ranges and offsets, single-ended or differential drive, and adjustable on-chip reference. AC inputs can be dc-restored with a built-in clamp function (A & K versions). An input out-of-range indicator is provided.

The AD9200JRS, for 0 to +70°C, and the AD9200ARS, for -40 to +85°C, are available in a 28-lead SSOP, and JST & KST versions, for 0 to +70°C, are available in 48-pin TQFP. Respective prices (1000s) are $5.95, $6.20, $6.45, and $6.70.

Stereo Audio Chips

AD1857/AD1858: 20/18/16-bits, 94-dB dynamic range

The AD1857 and AD1858 are complete stereo digital audio playback chips with a serial digital interface and buffered analog output. They include a revolutionary multibit modulator with dither, filtering, on-board digital de-emphasis, and mute. Dynamic range is 94 dB and THD+N is -90 dB, with very low out-of-band energy. Applications include digital cable TV and DBS set-top decoder boxes, video disks and CDs, DVD players, car audio, HDTV, etc.

The AD1857 serial data input port can be configured in 16-, 18-, or 20-bit left-justified, or I 2 S-justified modes. The AD1858 serial data input port can be configured in either 16-bit right-justified or DSP serial port compatible modes. Both devices are available in 20-lead SSOPs, for the 0 to +70°C range. Operation is on 5-V supplies. Price is $3.75 in 1000s.

256-Point Digital Pot

AD8400 replaces pots & trims, available in 1k,10k,50k,100kV

The AD8400 functions as a single digitally controlled potentiometer with 256 positions. It is available in a choice of resistance values: 1 kohms (5-MHz BW), 10 kohms, 50 kohms, and 100 kohms (low power). Performing basically the same electronic adjustment functions as a potentiometer or variable resistor, it is a member of a family of R-DACs that includes duals and quads (AD8402/3) [Analog Dialogue 29-1, 1995].

Typical applications are in updating designs of circuits using pots and trims; examples: programmable filters (communications), volume controls and panners (portable audio), line-impedance adjustment, gain and offset adjustment. Its digital input is an SPI-compatible serial data interface, and it requires a single 2.7 to 5.5-V supply. The AD8400 is available in 8-lead P-DIP and SO for -40 to +85°C. Price in 1000s is $1.12.

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Amplifiers, Mux, Reference, DC-DC

Fast Single/Dual OAs

AD8055/56: 300-MHz BW, 1400-V/µs SR, small size & $

The AD8055 and AD8056 are single and dual low-cost voltage-feedback op amps with 300-MHz bandwidth (-3 dB), 1400-V/µs slew rate, high output drive (70 mA), low distortion (-72 dB @ 10 MHz), and low power (quiescent current 5 mA per channel). Settling time is 20 ns to 0.1%. Use them for imaging, display, and communications circuitry. Ideal for video line driving, they have low differential gain (0.01%) and phase (0.02°) errors.

They are designed for ±5-V supplies and for operation over the -40 to +85°C temp-erature range. The AD8055 is available in a tiny 5-pin SOT-23 package, and the AD8056 is available in a microSOIC package. In addition, both types are available in 8-pin plastic DIPs and SOICs. Prices (1000s, any package) are $1.29 for the single AD8055 and $1.60 for the dual AD8056.

Rail to Rail Op Amp

OP184 works on +3,+5,615 V, has OP27-like performance

With performance comparable to the OP27, the OP184 is a single high-performance amplifier with rail-to-rail input and output ranges. It can operate from single +3 or +5- volt-, as well as ±15-V supplies. Its speed and precision are useful in a wide variety of industrial, telecom, and instrumentation applications. Its low offset (65 µV VOS) and noise (3.9 nV/Hz) are accompanied by a respectable 4-MHz bandwidth & 4.5-V/ms slew rate. Its outputs can sink and source 20 mA, and its inputs do not suffer phase reversal on overdrive.

Supply current is only 2.25 mA max over temperature. Like the dual/quad OP284/484, the OP184 is available in a choice of two performance grades and two packages. The OP184 is available in 8-pin plastic DIP and SOIC, for operation from -40 to +125°C. Price in 1000s is $1.50/$2.24 (F/E grades).

R-R OA in SOT23-5

AD8531: Tiny, low cost; can drive high-capacitance loads

The AD8531 is a single monolithic op amp in a tiny 5-pin SOT-23 package, with rail-to- rail input and output and an extremely low price tag. It can efficiently deliver high output currents, up to ±250 mA peak, with low quiescent current-1.25 mA max (5-V supply). It will drive resistive and capacitive loads, and is useful as a headphone driver, for PC audio boards, and cellular phones. Performance includes 3-MHz bandwidth and 5-V/µs slew rate, and it draws a low bias current of 50 pA. Its outputs will sink and source output current, and its input suffers no phase reversal when overdriven.

The AD8531, like its dual and quad versions, the AD8532/8534 [Analog Dialogue 30-3, p. 16], is designed to work on supplies from 2.7 to 5.5 volts, with a temperature range of -40 to +85°C. Its price in 1000s is $0.76 (yes, 76).

Series Vrefs in SOT23

Provide 2.5, 3.0, 4.096, 5 V AD158x source or sink 5 mA

The AD1582, AD1583, AD1584, and AD1585 are a family of bandgap series voltage references packaged in the tiny 3-terminal SOT-23 surface-mount package. They provide the designated outputs of 2.5, 3.0, 4.096, and 5.0 volts over a supply voltage range from +12 V down to (VOUT + 200 mV) and output current from -5 mA to +5 mA. Initial accuracy is to within 0.1% max, with temperature drift of ±50 ppm/°C max (B grade). Quiescent current is a low 65 µA max, and rms noise in a 10-kHz bandwidth is 50µV.

Their small package, low price, and low quiescent current suggest portable communications, computer, automotive, etc., applications. They operate at temperatures from -40 to +85°C. Two accuracy grades are available, A (1%) and B (0.1%), priced at $0.85 and $1.05 in 1000s.

4:1 Buffered Mux

AD8184 has highest speed, (700-MHz BW), lowest cost

The AD8184, the latest addition to ADI's family of buffered multiplexers, offers high performance on low power at lowest cost for a high-speed 4:1 buffered mux. It is also a pin-compatible upgrade for 4314- type muxes. Besides its 700-MHz -3-dB bandwidth, it is flat to within 0.1 dB to 75 MHz, has 0.01% differential gain and 0.01° differential phase errors, and can switch pixels within 10 ns. It has low crosstalk (-95 dB at 5 MHz), is compatible with TTL logic, and has a fast output disable feature for connecting multiple devices.

Use it for video switch arrays, multiplexing analog signals in imaging, and display switching. The 8184 works with supplies from ±4 V to ±6 V, draws little power (5.7 mA max over temperature: -40 to +85°C), and is packaged in a 14-lead narrow SOIC. Price in 1000s is $2.20.

28-Vin DC-DC Family

New 100-watt converters have integral EMI filters

Three new DC-DC converters have been added to the ADDC028xx 28-volt-input family (The 5-V, ±12-V, and ±15-V-output devices, announced in 1996, are now joined by 3.3-V, + or - 28-V, and pulsed 8-V units). Key characteristics are listed in the table below. These hermetically packaged DC-DC converters offer small size, light weight, and high reliability, and an integral EMI filter to help meet applicable EMI requirements of MIL-STD-461D. As system components, they include features such as current share, inhibit, status, sync; and protection features include thermal shutdown and input transient protection.

New DC-DC Converters
ADDC 02803SC 02828SA 02808PB
Input (V) 28 28 28
Output (V) 3.3 + or - 28 8
Output (A) 20 3.6 25 pulsed
Output (W) 66 100 200 pulsed

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Power Management, Supervisory Circuits

Lo-Dropout Regulator

100-mA anyCAP™ ADP3301: ±0.8% line/load regulation

The ADP3301 is a high-accuracy low-dropout linear voltage regulator with 100- mA minimum full-scale output for handling medium load currents in portable and battery-powered applications. Dropout voltage is typically 100 mV (200 mV max). 5 output options are available: 2.7, 3.0, 3.2, 3.3, and 5.0 V, with upstream supply voltage from 3 V to 12 V. The anyCAP™ circuit can be stabilized with any type of 0.47µF capacitor, regardless of its ESR.

To protect against overheating, current is automatically reduced for junction temperature >165°C; and a proprietary thermally enhanced package can handle 1 W of dissipation without an external heat sink or large copper surface on the board. The ADP3301 is available in an SO-8 package for temperatures from -20 to +85°C. Price for all voltage options is $1.07 in 1000s.

Dual LDO Regulator

ADP3302: 0.8% accuracy VDROP is 120 mV @ 100 mA

The ADP3302 is a high-accuracy dual low-dropout linear regulator comprising two independent 100-mA regulators with a common input (3 to 12 V), housed in an 8- lead SO package. The regulators have independent shutdown modes, and an error flag signals when either circuit is about to lose regulation. Overall accuracy is to within 0.8%. The ADP3302 is used in systems where two separate regulated voltages are required (e.g., 3.3 V and 5 V). Examples are cellular phones, notebook computers, and other battery-operated systems.

Features include anyCAP™ stability with any 0.47 µF capacitor, current and thermal limiting, low noise, and a thermally enhanced package. Voltage pairs available are 3.0, 3.0 V; 3.2, 3.2 V; 3.3, 3.3 V; 3.3, 5.0 V, and 5.0, 5.0 V. Operation is from -20 to +85°C. Price (1000s) is $1.78.

Micropower DC-DC

ADP1173/ADP1108: operate in boost or buck modes

The ADP1173 and ADP1108 micropower DC-to-DC converters can operate in either step-up (from =>2.0 V) or step-down (from =30 V) modes. They are available in a choice of either adjustable output, or three fixed output voltages: 3.3, 5, and 12 V. (The =>5-V versions can be used in existing 1173 and 1108 sockets, but 3.3 V is currently available only in the ADI version.) They can be used as positive-to-negative or negative-to-positive converters. Typical uses are in notebook/palmtop computers, cellular telephones, and portable instruments.

The two types are similar, except that the ADP1173 has lower fixed duty cycle, and ADP1108 uses a somewhat lower oscillator frequency. They are available in 8-lead PDIPs and SOICs for 0 to +70°C. Price (1000s) for ADP1108/1173: $1.93/$2.00 in PDIP, $2.09/$2.14 in SOIC.

Quad PS Monitor

ADM9264 flags when any of 4 supplies goes out of tolerance

The ADM9264 is a quad supply monitor IC. It monitors four power supply voltages simultaneously (12, 5, 3.3, and 2.8 V) and outputs error signals if any of the supplies go out of limits. It is designed for PC monitoring but can be used on any system where multiple power supplies require monitoring. The error signals are available individually and also gated into a common status output: PWR OK. A pair of auxiliary TTL-compatible inputs allow signals from other monitoring circuits (e.g., temperature sensor) to be linked in to the ADM9264.

It operates from a 2.5 to 6-V supply (75µA max) and requires no external components. Internal hysteresis minimizes sensitivity to transient power-supply fluctuations. The ADM9264 is housed in a 16-pin narrow SOIC and operates from -40 to +85°C. Price is $2.20 in 1,000s.

µP Supervisory ICs

ADM8690 to ADM8699 Retain original 690 timing

Supervisory circuits offer complete single-chip solutions for power-supply monitoring and battery control functions in µprocessor systems. The ADM8690 µP supervisory IC series is fully compatible with the ADM690 series (and other industry 690s), but has the additional benefits of ADM690A's packaging-, Vbatt-, and specifications. Functions include power-on reset during power-up, power-down, and brownout conditions, battery backup switching, a reset pulse if the watchdog timer has not been toggled within a specific time, a threshold detector for power fail warning, memory write protection, low-battery detection, etc.

Depending on function, they are available in various packages, including 8-lead plastic DIP & SO, and 16-lead DIP, TSSOP, & SO, for -40 to +85°C. Prices (1000s) range from $1.60 to $2.40.

3-Pin Reset Generator

Pretrimmed ADM809/810 Fully self-contained SOT-23

The ADM809 and ADM810 supervisory circuits are 3-pin fully self-contained reset generators. They monitor the power-supply voltage in µP systems and provide a reset signal during power-up, power-down, and brownout conditions. The ADM809 provides an active-low RESET signal, while the ADM810 provides an active-high RESET. Six threshold options are available for each type: 2.63, 2.93, 3.08, 4.00, 4.38, and 4.63 volts. The RESET output remains operational with VCC as low as 1 V.

On power-up, an internal timer holds reset asserted for 240 ms, keeping the µP in reset until conditions are stable. The ADM809/ ADM810 require 17 µA of supply current (60 mA max) from -40 to +85°C (100 mA max from +85 to +105°C). They are housed in the tiny 3-lead SOT-23 package (VCC, RESET, ground). 1000s price is $0.60.

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Temp Sensor, Codec, Communications & ATE ICs

Temp Sensor/Control

ADT14 has -40°C to +125°C range, 4 trip points, hysteresis

The ADT14 is a temperature sensor and controller that generates a voltage output proportional to temperature and provides 4 user-programmable temperature setpoints. An open-collector output signal that can sink 5 mA is generated as each setpoint value is exceeded. Three pin-strappable choices of hysteresis (0.65°, 1.5°, 5°) prevent rapid reversals on small changes. An internal 2.5- V reference facilitates programming of set points. The temperature output scale factor is 5 mV/K, with typical accuracy of ±3°C over temperature and linearity of 0.5°C. Use it in power supply monitors & controls, multiple fan-controller systems, thermal management in power converters & servers.

The device uses a 4.5 to 5.5-volt supply, drawing quiescent current of 600 µA. It is available in 16-lead plastic DIP and SOIC. Price in 1000s for SO/PDIP is $2.22/$2.44.

Voiceband Codec

AD73311: low-power analog speech/telephony front end

The AD73311 is a complete low-cost, low-power linear codec, with A/D & D/A conversion, programmable gain (PGA), and analog & digital filtering. It is suitable for many consumer and telephony applications, such as modems and speech recognition, synthesis, and compression. Its serial port is cascadable and connects easily with industry-standard DSPs; it is a natural companion for the ADSP-21xx family of products. Its signal-to-noise ratio (SNR) is 76 dB for the ADC, 70 dB for the DAC, with total harmonic distortion of -83 and -70 dB, respectively, & -90-dB crosstalk.

The AD73311 operates with supply voltage from 2.7 to 5.5 V, dissipating a maximum of 50 mW at 2.7 V (30 mW typical). It is available in 20-lead SO and SSOP packages for temperatures from -40 to +85°C. Price in 1000s is $4.15 (SO) and $4.65 (SSOP).

GSM 3-V Receiver IF

AD6458 has mixer, linear amplifier, I & Q demodulator

The AD6458 is a 3-volt low-power receiver IF subsystem IC for operation at input frequencies as high as 400 MHz and IFs from 5 MHz to 50 MHz. It consists of a mixer plus a linear-in-dB amplifier plus an I/Q demodulator, whose outputs can drive the AD6421 baseband converter. It is fully compliant with standard and enhanced GSM specifications. It has an 80-dB AGC range with external gain control, 9-dB noise figure for very high sensitivity, a -11-dBm 1-dB compression point to handle strong signals. It is useful in digital mobile radios (GSM, DCS, PCS) and other receivers.

The AD6458 is a low-power device; it draws 9 mA from the 3.3-V supply in receive mode at mid-gain to foster long battery life (1 µA in sleep mode). It is housed in a 20-lead SSOP for -40 to +85°C. Price in 1000s is $20.

GSM 3-V Transceiver

AD6432: complete IF signal processing, I & Q mod/demod

The AD6432 IF integrated circuit provides the complete transmit and receive IF signal processing, including I/Q modulation and demodulation, necessary to implement a digital wireless transceiver, such as a GSM handset. The AD6432 may also be used for other wireless TDMA standards using I/Q modulation. Its I/Q inputs and outputs are fully compatible with the I and Q interfaces of the AD6421 baseband converter. In digital communication systems, it down-converts from a high IF (up to 350 MHz) to a lower IF, and provides a high IF (up to a 300 MHz) modulated transmit signal from the I & Q baseband inputs.

It has high sensitivity (-10-dB NF). Using a 3-V supply, it draws 13 mA in receive mode at mid-gain for long battery life. It is packaged in a 44-pin plastic TQFP, for -25 to +85°C. Price in 1000s is $18.50.
Faxcode 2113

Hi-Speed Pin Driver

AD53040: up to 500-MHz Has driver Inhibit function

The AD53040, is a complete high-speed pin driver for use in digital or mixed-signal test systems. Its output can be programmed to any level from -3 V to +8 V, and it will swing through an amplitude range of from 100 mV to 9 V, to stimulate ECL, TTL, and CMOS logic families. It will handle data rates up to 500 MHz, with 50-ohms output impedance and >1.5-V/ns slew rate. To avoid loading outputs of I/O devices while they are being tested, its output can be switched into a high-impedance Inhibit state.

The AD53040 can supply 150 mA of dynamic output current and has static cur-rent limiting typically set at ±65 mA. It uses +12-V and -7-V supplies, drawing 75 mA from each, with 1.43-W total dissipation. It is packaged in a small 20-lead power SOIC (SOP) with a built-in heat sink, for ambients of -25 to +85°C. Price in 1000s is $34.
Faxcode 2171

Hi-Speed Active Load

AD53041 has 650-mA range, Inhibit mode, heat sink

The AD53041 is a complete high-speed current-switching load for use in linear, digital, or mixed-signal test systems. Its function is to force the device under test to sink or source a programmable current (IOH or IOL) of up to ±50 mA. The currents are programmable in three full-scale ranges (50 mA, 16 mA, and 5 mA) by two input voltages of 0 to 5 V, typically from a DAC. An Inhibit mode switches the output to high impedance within 2 ns, diverting the load current from the output to allow other sources to be applied to the DUT.

The AD53041 is housed in a 20-pin power SOIC with built-in heat sink. Its nominal supply requirements are +10.5 V and -5.2 V, with 160-mA maximum currents and maximum dissipation of 2.3 W. The device is specified at a nominal junction temperature of 85°C. Price in 1000s is $28.
Faxcode 2172

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