Analog Dialogue Current Issue

New Product Briefs

Amplifiers, Buffered Switches & Muxes

4-µA Op Amps

Dual OP281 & Quad OP481 Rail-rail outputs, 1-mV VOS

The OP281 and OP481 respectively comprise one and two pairs of very low power op amps having fast recovery times (useful in comparator applications) sink/ source outputs without increased supply current when at the rails. Maximum supply current is 4 µ A per amplifier (5 µ A from ­ 40 to +85° C). Operation is guaranteed with single supply from 2.7 to 12 V, and the devices are specified at +3, +5, and ± 5 V.

The low power consumption enables operation for years on batteries, for remote sensors, and for applications such as security systems and medical instrumentation. The OP281 is available in 8-pin DIP, SOIC, and TSSOP packages; the OP481 is available in 14-lead DIP, TSSOP and narrow-body SO. Prices (1000s) start at $2.44 for the duals, $3.19 for the quads. Faxcode 2075*

Ultrafast Op Amp

AD8009 has 1-GHz BW 5500 V/µs SR, 175 mA Output

The AD8009 is an unusually fast, low-distortion monolithic current-feedback operational amplifier, characterized by 1-GHz typical small-signal bandwidth (G=+1), 440-MHz large-signal bandwidth (G=+2), 5500-V/µ s slew rate, and 10-ns settling time to 0.1%. It has a SFDR of 44 dBc at 150 MHz and a 3rd-order intercept of 18 dBm at 150 MHz.

It can furnish 175 mA of load current, will drive 4 back-terminated video loads, and has excellent video specifications, viz., differential gain and phase errors of 0.01% and 0.01° , with 150-ohms load. The AD8009 operates at ± 5 V, drawing about 14 mA. Typical applications are in pulse handling, video, RF/IF, and high speed test and instrumentation. Housed in an 8-pin SOIC, it operates over the ­ 40 to +85° C range. Price in 1000s is $2.99 Faxcode 2079*

16x16 Video Switch

256-point, 200-MHz AD8116: Crosspoint has output buffers

The AD8116, the world’s first 16 x 16 video crosspoint switch IC, and the first of a family, routes video signals from any of its 16 inputs to any of its 16 buffered outputs (which are 3-statable and can drive 150 ohms), as programmed by an 80-bit serial word. It has ­ 3-dB bandwidth of 200 MHz and switching time of 60 ns for 0.1% settling. It can route many types of signals, including compressed or uncompressed composite or component video signals. Its uniquely high speed and compact size are helpful for building large wideband switch arrays. Applications include broadcast video, surveillance and video conferencing, video on-demand, and inflight entertainment.

It is packaged in a 128-lead TQFP (14 mm x 14 mm) and is specified for 0 to +70° C. It requires a ± 5-V supply, and dissipates only 900 mW. Prices start at $105 in 100s. Faxcode 2070*

xDSL Driver/Receiver

Differential 500-mA drivers, Low-noise preamplifier pair

The AD816 comprises two 500-mA current drivers and two low-noise (4 nV/Hz) voltage-feedback amplifiers (with 70-mA drive capability), combining drive and preamplification on a single monolithic chip. It functions as the line interface to and from the telephone line in telecommunications applications such as ADSL, providing up to 26 dBm of differential line drive. It can also be used in CRT monitors, and its voltage-FB amplifiers are useful in active filters.

The thermally overload-protected driver can apply 40 V p-p differential output to a 50-ohms load at 1 MHz or furnish 1 A of peak current to a 15-ohms load with a 1% duty cycle. The AD816 is available in low thermal resistance power packages, operates from ­ 40 to +85° C, and is specified with ± 15-V supplies, drawing 59 mA max of quiescent current. It is priced at $7.25 in 1000s. Faxcode* 1978

VGA: Linear Gain (dB)

AD604/605 duals have low noise, 40-MHz bandwidth

The AD604 and AD605 are high-performance wideband (40-MHz) 2-channel variable-gain amplifiers (VGA). Gain is linear in dB as a function of control voltage. They can be used to control signal gain & attenuation in AGC applications or as a time-gain amplifier in medical ultrasound. The AD604, optimized for low noise (0.8 nV/Hz RTI), offers gain ranges from 0 through +48 dB and +6 through +54 dB. In addition, control-voltage sensitivity can be scaled from 20 dB/V through 40 dB/V. The single-supply AD605 has gain ranges of ­ 14 to +34 dB and 0 dB to +48 dB.

They are available in plastic DIP and SOIC packages for operation from ­ 40 to +85° C. The AD605, available in A and B grades, has 16-pins; the AD604, operating from ± 5-V supplies, has 24 pins. AD604/605 price in 1000s starts at $11.90/$8.90.

Fast Buffered Muxes

700-MHz AD8170/74 (2:1/4:1) 750-MHz ’80/’82 (2:1, 2x2:1)

The AD8170, -74, AD8180, and -82 muxes select between wide-bandwidth input signals, and switch them in <10 ns. typical applications are in large video switcher and router arrays, scanners, picture-in-picture video, and mpeg video for pcs. all four devices have buffered inputs & outputs. the AD8174 switches 4 signals; the AD8170 switches 2 signals, with a 250-MHz BW (G=+2). In both, a current-feedback amplifier buffers the output; its gain can be set with external resistors. The AD8180 switches two signals with a bandwidth of 750 MHz; the AD8182 is a dual 2:1.

Power consumed is low (± 5 V,<10 ma), but the ’7x deliver >50 mA and the ’8x deliver >30 mA. They operate from ­ 40 to +85° C, are housed in 8- and 14-lead PDIPs and SOICs. Prices (1000s) are $1.95/$2.95 (’80/’82) and $2.25/$3.95 (’70/’74).

A/D and D/A Converters, Volume Controls

12-Bit µpower D/A

2.7 to 5.5-V, 100-µ A rail-rail AD7392/93: pin-compatible

With a maximum IDD of 100 µ A, the 12-bit AD7392 and 10-bit AD7393 are the newest members of a family of DACs having ultra-low power consumption. Operating on a 2.7 to 5.5-volt single supply, they offer a pin-compatible choice of parallel-loading 12 or 10-bits, allowing a cost/resolution tradeoff without board layout changes. Typical dissipation in 3-V operation is 165 µ W; in shutdown, supply current drops to 0.1 µ A.

The output range is rail to rail (0 to VDD), and the (multiplying) reference input can be tied to VDD. Both devices are available for ­ 40 to +85° C. Packaging is in 20-pin PDIPs and SOICs; AD7393 versions are also available in a 1.1-mm high tiny TSSOP-20, for PCM card applications, and in a SOIC for ­ 40 to +125° C for automotive applications. Prices (1000s) start at $2.95 for the AD7393 and $5.06 for the AD7392. Faxcode* 2068

Two 16-Bit, +5-V ADs

AD7722: p - D, serial/parallel AD976/A: 2x faster 2nd source

The AD976, pin-compatible with the ADS8705, is a 16-bit low-power +5-V single-supply successive-approximation ADC. It samples at up to 100 ksps, and the AD976A version samples at 200 ksps. The device has an on-chip clock and 2.5-V reference, accepts inputs up to ± 10 V, and dissipates only 100 mW. Operation is from ­ 40 to +85° C. Packaging is in 28-pin DIP, SOIC, and SSOP, and prices for AD976/A in a plastic DIP (1000s) are $20/$26.

The AD7722 is a complete sigma-delta ADC with signal bandwidth up to 100 kHz and output word rate up to 220 ksps (14-MHz clock). It has an on-chip reference and can interface in either parallel or serial mode (a pair of converters can share the serial bus). Input range is 0 to +2.5 V or ± 1.25 V. It draws 375 mW, is available in a 44-pin PQFP for ­ 40 to +85° C. Price (1000s) is $20.

8-Bit, 200 MSPS ADC

AD9054 uses only 500 mW, has 380-MHz full-power BW

The AD9054 is an 8-bit monolithic A/D converter optimized for high speed, low power, small size, and ease of use, using an innovative bit-per-stage folding architecture with many advantages over traditional “flash” converters. Its output is interleaved between two TTL-compatible output ports at one-half the clock rate, reducing interface speed and buffer memory cost. 80-MHz SINAD (200 MSPS) is 43 dB. Applications include RGB video processing, digital data storage read channels, medical imaging, direct-IF & undersampling in digital communications.

It operates on a single +5-V supply and has an internal 2.5-V reference. The analog input range is 1 V p-p. Two speed grades are available in a 44-pin TQFP200 MSPS and 135-MSPS sample rates. Respective prices in 100s are $48 and $28. Faxcode* 2093

12-Bit A/D Choices

Simultaneous dual AD7862 Single serial 3.8-µs AD7895

The monolithic AD7862 comprises two 250-ksps 12-bit simultaneous sampling ADCs, each with multiplexed dual inputs. It includes an on-chip reference and parallel digital interface and requires a +5-V supply (60 mW dissipation, 50-µ W in power-save mode). Available grades are A & B (­ 40 to +85° C) and S (­ 55 to +125° C). There is a choice of ± 10, ± 2.5, and 0 to +2.5-V input ranges. Housing is in PDIP, SO, SSOP, & Cerdip. Prices (1000s) start at $11.

The AD7895 is a fast 12-bit single-supply ADC (+5-V, 20-mW) with automatic power-down. It converts in 3.8 µ s and has a high-speed, easy-to-use serial interface. It is available in 8-pin mini-DIP and SOIC for ­ 40 to +85° C in A/B grades, and a choice of ± 10, ± 2.5, & 0 to +2.5-V high-impedance-input ranges. Price (1000s) is $4.95/$6.80.

Triple 8-Bit Video D/A

360-MHz, 196-bit ADV7129 Complete with PLL and V ref

The ADV7129 is a complete analog-output video DAC on a single CMOS chip, designed to drive ultra-high-resolution (2 K x 2 K) color monitors. It includes three 8-bit video DACs (RGB), a programmable pixel port, and an internal voltage reference. An on-board phase-locked loop clock generator provides high-speed operation without requiring high-speed external crystal or clock circuitry. The 192-bit input port enables full 24-bit true color pixel data to be displayed at pixel speeds of up to 360 MHz.

Its analog outputs are RS-343A/RS-170 compatible, and its digital inputs are TTL-compatible. It is fully controlled through its 8-bit MPU port by on-board command registers. It uses a single +5-V supply, has an internal voltage reference, and is available in a 304-pin PQFP package for 0 to +70° C. Its price in 100s is $765. Faxcode* 1854

Vol/Bal-Control ICs

6, 4-channel SSM2160, 2161 Clickless operation, serial in

The SSM2160 and SSM2161 are complete 6- and 4-channel clickless digital volume and balance control ICs. They accept 6 (or 4) audio signals and either amplify (up to 31 dB) or attenuate (over 100 dB) each one. A Master Control sets the attenuation, while a Channel Control enables balance to be adjusted. They are principally applied as the main volume/balance controller for a DVD player, multi-channel audio amplifier, hi-fi receiver, professional sound mixer, or com-munications voice processor.

Audio characteristics include THD+N of 0.01% and 0.001% IMD. Both devices can operate from single or dual supplies; e.g., the SSM2160 operates from +10-V to +20-V single supplies or ± 5 to ± 10-V dual supplies. They are available in PDIP and SO packages for 0 to +70° C operation. Prices (large quantity) are as low as 60/channel. Faxcode* 1848

Power Management Supervisory Circuits

Step Up/Step Down

ADP3000 switching regulator Micropower, high-frequency

The ADP3000 is a versatile step-up/step-down switching regulator that operates from an input supply of 2 to 12 V in boost mode and up to 30 V in buck mode. An adjustable and 3 standard fixed-output versions are available for 3.3, 5, and 12 V. The 3.3-V version can deliver an output current of 100 mA at 3 V from a 5-V input in step-down, and 180 mA at 3.3 V from a 2-V input in step-up configuration.

Few external components are required; and operation at a high switching frequency (400 kHz) allows the use of small inductors and capacitors. Operating in the pulse-frequency mode (PFM), it consumes only 500 µ A. It has an on-chip low-battery detector, and the output current limit is user-settable. The ADP3000 is available in 8-pin DIP and SO-8 packages for 0 to +70° C. Prices (1000s): $2.14/$2.28 (PDIP/SOIC). Faxcode* 2028

Batt-Chge Controllers

Secondary side off-line ADP3810/11: LiIon/NiCd, NiMH

The ADP3810 and ADP3811 precision battery-charger controllers combine user-programmable current limiting and precise voltage control to charge lithium-ion, nickel-cadmium, and nickel metal-hydride batteries (popular batteries for portable computing and communications gear). They combine a precision 2-V reference, control input buffer, under-voltage-lockout comparator, output buffer, and over-voltage comparator in an 8-pin SOIC for ­ 40 to +85° C.

Charging currents are programmable from typically 100 mA to 1.1 A. The ADP3810 features on-board precision resistors for ± 1% overall accuracy when charging Li-ion batteries; it is optionally available for 4.2, 8.4, 12.6, and 16.8 V. The ADP3811 is programmable via external resistors, for a wide range of user-selected voltages. Prices (1000s) are $2.57/$2.43, respectively. Faxcode* 2069

1-30 Volt Supplies

Step-up, step-down, fixed or adjustable µ power sw. regs.

The ADP1110 and ADP1111 are members of a family of step-up/step-down switching regulators with 3.3, 5, and 10-V fixed outputs, as well as adjustable-output versions. The 5-V, 10-V, and adjustable versions are pin-for pin replacements for existing 1110 and 1111 devices; the 3.3-V versions are currently available only from Analog Devices. The ADP1110 has an input supply range from 1.0 to 30-V, permitting use on single cell batteries; the ADP1111’s input range is from 2-12 V in step-up, and 2-30 V in step-down.

Typical applications for the ADP1110 are in cellular telephones, pagers, cameras, laser-diode drivers, and handheld inventory computers. Both devices are available in 8-pin plastic DIPs and SOICs for operation from 0 to +70° C. Prices in 1000s for PDIP/SOIC are $2.42 /$2.57 for ADP1110, $1.93/$2.07 for ADP1111.

Switching Regulators

High-efficiency synchronous ADP1148 step-down family

The ADP1148 is a high-efficiency (>95% at 200 mA) synchronous step-down switching regulator with operating supply range from +3.5 V to +18 V. It is available for 3.3-V, 5-V and adjustable outputs; the 5-V and adjustable versions are pin-for-pin replacements for existing 1148 devices; the 3.3-V version, for use in low-voltage systems, is currently available only from Analog Devices. The ADP1148 switches a pair of external complementary MOSFETs at frequencies up to 250 kHz.

The ADP1148 has an automatic power-saving sleep-mode (2 mW at 10 V in) when load current drops below the level required for continuous operation. In logic-controlled shutdown mode, only 20 µ A are required.The ADP1148 is available in 14-pin PDIPs and SOICs for ­ 40 to +85° C. Respective prices (1000s) are $3.18/$3.31. Faxcode* 2023

µP Supervisory ICs

Low-cost ADM708ARM Available in µSOIC packages

The ADM708ARM is a low-cost µ P supervisory circuit for monitoring +5-V supplies/batteries and microprocessor activity. It is the first of the ADM70x family to be available in a tiny 8-pin µ SOIC package (one-half the area of an SO-8). It provides a pre-trimmed 4.4-V power-fail reset, manual reset de-bounce, and reset pulse-generator for a microcontroller. It is complete, requires no external components, and draws only 200 µ A of quiescent current.

It can be used in all kinds of microcontroller applications, including printers, modems, PC settop boxes, drives, telecom cards, routers, etc., and is well-suited for mobile applications. Its electrical specs are the same as those of the ADM708AR, and it is form, fit, and function-compatible with 708CUA. The ADM708ARM is specified for ­ 40 to +85° C. Price in 1000s is $0.84 (i.e., 84!) Faxcode* 1866

µP Supervisory ICs


The ADM690A and ADM691A are the first small-package versions in the ADM69x family of Supervisory Products circuits. (More are coming!) The ADM690 is now available in 8-pin DIP (-AAN), SOIC (-AARN), and µ SOIC (-AARM); the ADM691 is available in 16-pin DIP (-AAN), wide SOIC (-AARW), narrow SOIC (-AARN), and TSSOP (-AARU).

The functions of both devices include Watchdog timer, VCC Reset, Automatic backup battery power switching, and Power fail monitoring. In addition, the AD691A’s design includes fast onboard gating of Chip Enable signals and low line status indication. All A version devices allow the Vbatt terminal to float when not connected. All versions operate from ­ 40 to +85° C. Prices are low, starting at (1000s) $1.44 (ADM690AARM) and $1.60 (ADM691AARM).

Mixed Bag: Communications, Video, DSP

Low-Cost SHARC

ADSP-21061: 120 MFLOPS 1 Mbit dual-ported SRAM

The ADSP-21061 is the first in a family of low-cost SHARC™ (Super Harvard ARchitecture Computer) DSPs. It features a high-performance 120-MFLOPS/120 fixed-point MOPS core. Its 1 Mbit of dual-ported on-chip SRAM stores up to 32 K 32-bit words. To eliminate bus bottlenecks, six DMA channels support background I/O transfers. An integrated host interface supports 16-bit or 32-bit µ P. Two high-speed serial ports (40 Mbits/s) interface to industry-standard peripherals. The ADSP-21061 is pin-compatible with and runs the same source code as other SHARC DSPs.

It is a high-performance solution for price-sensitive applications in audio, graphics, communications, video, conferencing, and imaging. Development support packages and samples are available now. ADSP-21061 prices are $64 in 1000s, $49 in 10,000s.

CCD Signal Processor

AD980x: 12/10-bit, 6 MSPS Complete on a chip, PQFP-64

The AD9807/AD9805 is a complete single-chip charge-coupled-device (CCD) imaging decoder and signal processor.It integrates all of the signal conditioning and correction needed for most mid-range scanner applications. Its three color-component inputs can be directly ac-coupled from the CCD, and its output is a processed 12/10-bit parallel word. Included is circuitry to perform 3-channel correlated double sampling (CDS) and adjustment of the programmable gain. After conversion to digital, on-board DSP circuitry corrects for pixel rate offset and gain, and odd/even CCD register imbalance errors. A parallel control bus acts as a simple interface to µ Cs.

Operation is specified from 0 to +70° C on +5-volt analog and digital supplies, with dissipation of 530 mW max and packaging in a 64-pin PQFP. Its price in 1000s is $25. Faxcode* 2021

GSM Receiver IF

AD6459 is a 3-V subsystem: Mixer, Linear amp, I/Q Demod

The AD6459 is a 3-V, low-power receiver IF subsystem. Optimized for operation in GSM, DCS1800, and PCS1900 receivers, it is used in digital communication systems (cellular, satellite, and private mobile radio) to convert a signal from a high IF (up to 500 MHz) to a lower IF (5 MHz to 50 MHz), amplify the signal, and provide demodulated I and Q outputs. It consists of a mixer, an IF amplifier, I and Q demodulators, a phase-locked quadrature oscillator, a precise AGC subsystem, and a biasing system with external power-down.

It interfaces to AD7013, AD7015, and AD6421 baseband converters, will operate on supplies from 2.7 to 5.5 V, and draws 8 mA at mid-gain (and only 2 µ A in Sleep mode). It is packaged in a 20-lead SSOP for operation from ­ 25 to +85° C (­ 40° C for supply =>3.3 V). Its price (1000s) is $5.95. Faxcode* 2079

Video Encoder

AD724: RGB to NTSC/PAL PLL helps reduce system cost

The AD724 is a low-cost RGB to NTSC/ PAL encoder; it converts red, green, and blue color component signals into their corresponding luminance (baseband phase and amplitude) signals in accordance with either NTSC or PAL standards. It also makes available composite video output. All 3 outputs can simultaneously drive 75-ohms, reverse-terminated cables. It is an improved version of the AD722 and is pin-compatible when its RGB inputs are properly bypassed.

The AD724 lowers system cost, by virtue of its on-chip PLL, which enables the use of a low-cost FSC crystal for generating all the timing. However, it will also accept FSC or 4FSC clocks, and it can accept CSYNC or HSYNC/VSYNC. It uses a single +5-V supply, is packaged in a 16-pin SOIC for operation from 0 to +70° C. Price (1000s) is $4.55, and less than $3 in 10,000s. Faxcode* 2056

Pulsewidth Modulator

AD9561: for high-resolution copier- & printer applications

The AD9561 is a second-generation high-speed, digitally programmable pulsewidth modulator (PWM). Its output pulsewidth is proportional to an 8-bit digital word (from 5 ns to 100% FS). Two additional control inputs determine if the pulse is located at the beginning, middle, or end of the clock period. Pulsewidth and placement can be changed every clock cycle up to 60 MHz.

It is principally useful in copiers and printers that feature very high resolution and/or image quality (“photorealistic” is the appropriate buzzword). Pulse modulation is the only cost-effective method to obtain both high spatial resolution and wide gray-scale dynamic range (see Analog Dialogue 27-2, pp. 10-11). The AD9561 operates from a +5-V supply and is housed in a 28-lead SOIC. It operates over the 0 to +70° C temperature range. Price in 1000s is $7.40. Faxcode* 2027

155-Mbps Transceiver

AD6816: A complete ATM chip for UTP#5 copper or fiber

The AD6816 provides a single-chip physical layer solution for interfacing an asynchronous transfer-mode (ATM) user-network interface IC to either a Category #5 unshielded twisted pair (UTP) system or a fiber optic system. The AD6816 provides line equalization and baseline restoration, line driver, clock recovery and data retiming, local reference clock oscillator, and frequency synthesis functions. Typical applications are in network interface cards and switching-hub multiport boards.

Complying with ATM UNI 3.1 and SONET/SDH OC-3/STM1, it offers a lowest power, complete solution for analog functions, and allows partitioning between analog and digital functions for a lowest-cost system solution. It is housed in a TQFP-44 for 0 to +70° C and +5-V supply (95 mA max). Price (10,000s) is $23.45. Faxcode* 2080

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