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• µPower References
• 14-Bit, 125-MSPS
• Dual 10-Bit TxDAC+
• Dual 8-Bit Serial DAC
• Triple IFB Op Amp
• 260-MHz Dual Buffer

• 8-Bit, 32-MSPS ADC
• AD7731 has buffered inputs
• 16-Bit,5-V ADCs
• 8-& 10-Bit ADCs
• 4-& 8-Channel ADCs
• Serial ADCs

• DECT IF Transceiver
• 1-Chip RAS Modem
• MODIO HSP Codec
• DDS with On-Chip D/A
• RS-485 Transceivers
• Supervisory IC

• Low-Cost SHARCs
• CCD/CIS Processor
• CCD Processor
• Regulator Controller
• AC Motor Controller
• LD Regulators

They are specified for 2.7, 3.0, and 5.0-V min supply voltage, 15, 15, and 18 mA max supply current, 420, 480, and 640 nVHz noise density at 1 kHz. The best grades have initial accuracy to within ±2-mV and 8-ppm /°C tempco. Minimum full-load output current is 5 mA. Each is available in three performance grades specified at –40 to +85°C and –25 to +85°C. They are available in 8-lead SOICs and TO-92s, and 3-pin TSSOPs. Prices start at $1.95 in 1000s.

14-Bit, 125-MSPS D/A AD9764 TxDAC® : 2.7 to 5.5 V Optimized for SFDR, THD, IMD
The AD9764 brings 14-bit-resolution to the TxDAC® series of high-performance, low-power, pin-compatible CMOS DACs. It is designed for reconstructing wideband, high-dynamic- range signals in communications and test equipment. Its excellent IMD and SFDR performance for single- and multitone signals upgrades existing communication systems and permits new wideband transmit architectures. Its applications include base stations and ADSL & HFC cable modems.

Characteristics include update rate of 100 MSPS min, 125 typical, 2.7 to 5.5-V supply voltage, on-chip reference, 20-mA current output, 45 mW dissipation @ 3 V, and Sleep mode. The CMOS device is available in a 28-lead SOIC for temperatures from –40 to +85°C. An evaluation board is available. Prices are $19.18 in 1000s for the AD9764, $150 for the evaluation board.

Dual 10-Bit TxDAC+™ 40-MSPS AD9761 for I&Q has dual 23 interpolation filters
The AD9761, the latest addition to ADI’s family of transmit DACs, is a subsystem-on-a- chip, based on the TxDAC® core. It consists of a matched pair of high-performance 40-MSPS 10-bit DACs, optimized for low distortion (58-dB SINAD, 9.5 ENOB, 65-dB SFDR) for flexible handling of QAM I & Q data. Included are a pair of 2´ digital interpolation filters with 62.5-dB stop-band rejection and an on-chip 1.2-V reference.

The AD9761 provides 10-mA of output current and operates on a 2.7 to 5.5-V supply with only 200 mW dissipation at 3 V. A Sleep mode reduces input current by a factor of about 9. The DACs share a common 20-MSPS interleaved data interface. Operation is from –40 to +85°C, and the device is housed in a 28-lead SSOP. Its price (1000s) is $11.95.

Dual 8-Bit Serial DAC Lo-power +2.7/+5.5-V Ad7303 in 8-pin PDIP, SOIC, µSOIC
The AD7303 is a dual 8-bit serial input, voltage-output D/A converter with a supply voltage range of +2.7 to +5.5 V. Its on-chip precision output voltage buffers allow the DAC outputs to swing rail-to-rail. The shared input is a 3-wire serial interface that operates at clock rates up to 30 MHz; it is compatible with QSPI, SPI, microwire, and digital signal-processor interface standards. The control portion of the 16-bit input register addresses the relevant DAC, provides device or chip power-down, selects internal or external reference, and can provide for simultaneous updating.

Ideal for portable battery-operated equipment, the AD7303 consumes only 7.5 mW max at 3 V and less than 3 mW with full power-down. It is available in 8-pin plastic DIP, SOIC, and µSOIC, for –40 to +105°C. Prices start at $2.35 in 1000s.

Triple I_FB Op Amp AD8023 has 250-MHz BW Drives heavy capacitive loads
The AD8023 has a trio of fast-settling current-feedback operational amplifiers with individual Disable on a single silicon chip. They can drive loads (including capacitive) at up to 70 mA, while drawing only 10 mA max quiescent current. This makes the device useful in RGB video systems that require good flatness over a wide bandwidth, while drawing minimal power. Bandwidth is 250 MHz (10 MHz with 0.1-dB flatness), with 1200 V/ms slew rate and 30-ns 0.1% settling (300 pF, 1 k load).

Video differential gain and phase errors are 0.06% and 0.02°. The Disable feature (1.3- mA power-down, high-impedance output) turnoff time is 30 ns. The AD8023 operates (–40 to +85°C) with single (+4.2 to +15 V) or dual (±2.1 to ±7.5 V) supplies, and the device is housed in a 14-lead plastic SOIC. Price (1000s) is $3.99.

260-MHz Dual Buffer AD8079: 0.01% G, 0.028 60.1-dB flat to 50 MHz
The AD8079 is a dual fixed gain buffer for video and other wideband applications. It is optionally available with pin-strappable fixed gains of +2, +1, and –1 (A grade) and +2.2, +1, and –1.2 (B grade); the latter permits compensation of system gain losses. The 70- mA output can drive up to 8 video loads. Bandwidth is 260 MHz (–3 dB), and response is flat within ±0.1 dB to >50 MHz.

Typical applications are for differential driving of twisted pair wiring, and for buffering inputs and outputs of switches, such as the AD8116 crosspoint. Differential gain and phase errors are 0.01% and 0.02°, respectively, and crosstalk is –70 dB at 5 MHz. Quiescent dissipation is only 50 mW per amplifier. The device operates on supplies from ±3 V to ±6 V and is available in an 8-pin plastic SOIC. Prices start at $3.50 (1000s).

8-Bit, 32-MSPS ADC Low-$ AD9280: 2.7 to 5.5 V Has 300-MHz analog BW
The AD9280 is a low cost 8-bit, 32-MSPS A/D converter with 2.7 to 5.5-V single-supply operation and low power consumption (95 mW at 3 V). It has a wide-bandwidth input sample-hold (300 MHz), a programmable internal reference, and a flexible input structure. It also incorporates clamping (useful in video "dc restoring"), Sleep mode (to conserve power), an out-of- range indicator, and 3-state output buffers. The AD9280 is used to digitize high-speed analog data in video, CCD signal chains (scanners, etc.), and com-munications systems.

Performance includes differential non-linearity of 0.2 LSB, and 7.7 ENOB at 16 MHz. The AD9280 is housed in a 28- pin SSOP, for temperatures from –40 to +85°C, and is pin-compatible to the 10-bit AD9200. Price in 1000s is $3.37.

B24-Bit - ADC AD7731 has buffered inputs serial interface, on-chip PGA
The AD7731 is a complete 24-bit low-noise (55 nV rms typical), high-throughput A/D converter for industrial measurement and process-control applications. It incorporates a 7-step binary-programmable-gain amplifier, allowing input signal ranges from 20 mV to ± 1.28 V. Throughput is programmable, from 50 Hz up to 6400 Hz. The sigma-delta architecture uses an analog modulator and a low-pass programmable digital filter, allowing adjustment of filter cutoff, output rate, and settling time.

Its 3-wire serial output is compatible with microcontrollers & digital signal processors. It operates from a single +5-V power supply and can accept external references ranging from 1 V up to (and including) the +5-V positive rail. It is available for –40 to +85°C packaged in 24-lead PDIP, SO, and TSSOP. 1000-lot price is $9.86.

16-Bit, 5-V ADCs AD977 upgrades ADS7809 AD977A: 200-ksps thruput
The AD977 and AD977A are 16-bit serial-output A/D converters with a wide choice of analog input ranges (±10 V, ±5 V, ±3.3 V, and 0 to 10, 5, and 4 V). Requiring minimal support circuitry and low power, they contain internal references, provide low cost/performance, and run from a single +5-V supply. Their inputs are protected against voltages up to ±25 V. Consuming only 100 mW, the AD977A runs at 200 ksps (100 ksps for the AD977). In the power-down mode, dissipation is only 50 uW.

The devices contain a successive-approximation ADC, an internal 2.5-V reference, and a high-speed serial interface, and include on-chip clock circuits. Available in 20-lead plastic DIPs and SOICs, and 28- lead SSOPs, they operate from –40 to +85°C. Price (1000s) in PDIP is $20 for AD977, and $26 for AD977A.

8-,10-Bit ADCs 2.7 to 5.5-V AD7819/AD7813 have 200/400-ksps thruput
The AD7819 and AD7813 are pin-compatible 8- and 10-bit low-power single-supply sampling A/D converters. They are housed in 16-pin DIP, SOIC and TSSOP packages. Normally dissipating a low 17.5 µW max in full operation, they dissipate 5 µW max in power down; and in the automatic-power-down-between-conversions mode, the AD7813 dissipates only 34.6 µW max at 1 ksps, and 3.5 mW max at 100 ksps.

Both devices have an identical 8-bit parallel interface for easy interfacing to µPs and DSPs. The AD7813 reads out 10 bits with a 2nd 2-bit byte. The AD7819 and AD7813 operate over respective temperature ranges of –40 to +125°C and –40 to +105°C. They can use an external precision reference or the power supply. Prices (1000s) are $1.95 (AD7819) and $2.55 (AD7813).

4- & 8-Channel ADCs 10-bit serial AD7811/AD7812: 350 ksps thruput, 2.5-5.5 V_S
The AD7811 and AD7812 are 10-bit sampling A/D converters with serial digital interfaces and multiplexed 4- and 8-channel analog inputs. They operate from 2.7 to 5.5- V supplies and have a maximum throughput of 350 ksps. They accept analog inputs over the range of 0 V to +VDD; and users can employ the on-chip references, external precision references, or the supply voltage. Their low power consumption (315 µW at 10 ksps), ability to power down after conversions, and small package size (16-pin TSSOP) make these devices particularly suitable for portable and power-consumption- critical applications.

The serial interface is compatible with the serial interfaces of most µCs and DSPs. A Package Address pin allows bus sharing. Operation is specified from –40 to +105°C. Prices (1000s) are $2.90 and $3.30.

8-, 10-Bit Serial ADCs AD7823/AD7810 operate on 2.7–5.5 V; 8-pin DIP, SO, µSO
The AD7823 and AD7810 are pin-compatible 8- and 10-bit low-power single-supply sampling A/D converters with serial interfaces and maximum throughput rates of 135 and 350 ksps. They are housed in 8- pin DIP, SOIC and µSOIC packages. Normal dissipation, a low 17.5 µW max in full operation, drops to 5 µW max in power down (data can be read); and in automatic-power- down-between-conversions mode, the AD7810 dissipates only 27 µW max at 1 ksps, and 2.7 mW max at 100 ksps.

Both devices have microcontroller-compatible serial interfaces for fast, easy interfacing. The AD7823 and AD7810 operate over respective temperature ranges of –40 to +125°C and –40 to +105°C. They can use an external precision reference or the power supply. DIP-package prices (1000s) are respectively $1.95 & $2.45.

DECT IF Transceiver AD6402 integrated subsystem for multichannel base stations
The AD6402 is an IF subsystem used in high-performance TDMA (time-domain multiple access) digital radios employing FSK, GFSK, FM, and QPSK modulation schemes. Designed primarily for digital enhanced cordless communication (DECT), it can be used in any similar radio architecture with 1-MBPS bit rates. Highly integrated, it includes a limiter stage with inter-stage filter, RSSI detection, a PLL demodulator, IF VCO, IF buffers, VCO regulator, and power management.

The AD6402 has multiple power-down modes to maximize battery life. Using an on-chip PLL demodulator, it requires no manufacturing trims; an integrated 2nd IF filter further reduces external component count. It will operate with ³2.7-V supply, is housed in a 28-pin SSOP, and operates from –25 to +85°C. Price in 1000s is $6.55.

1-Chip RAS Modem Interfaces ISP serial T1 or E1 lines to digital network
The ADSP-21mod870 is the world’s first complete single-chip digital modem for remote-access servers (RAS). It is optimized for implementing a complete V.34/56K modem. Since its bundled cost includes software, controller, memory, and data pump, it needs no external memory or data controller. At 2.58 cm² (0.4 in² ), and dissipating only 140 mW (3.3 V) in the active mode, it has the smallest size and lowest dissipation per channel—plus the lowest cost—among available alternatives.

Based on the ADSP-2100 family architecture, each chip (i.e., modem port) can be reprogrammed on demand. New protocols can be downloaded, existing protocols updated. Any protocols may be loaded automatically depending on the user’s modem speed. Packaging is 100-pin TQFP. Bundled per-channel cost is $28.

MODIO™ HSP Codec AD1821 single-chip audio & comm subsystem for PCs
The single-chip AD1821 MODIO™ (modem over audio) Soundcomm™ HSP audio and communications subsystem for personal computers includes the AD1821 mixed-signal controller IC and MODIO host signal-processing (HSP) software drivers. It has full legacy compatibility with applications written for Soundblaster Pro and AdLib, also servicing Microsoft PC 97 applications.

Included are an OPL3-compatible music synthesizer, Phat™ circuitry for stereo output phase expansion, a joystick interface with timer, serial ports for DSP and I 2 S (2). The MODIO drivers use CPU resources to implement the flow of high-speed fax, data, and voice (with Echo Cancellation) while simultaneously handling audio signals. The AD1821 operates from a +5-V supply, is housed in a 100-lead PQFP. Price (10,000 per month) is $18 ($15 modem only).

Faxcode 2252

DDS with On-Chip D/A AD9832 is complete, for 25-MHz clock, has 10-bit DAC
The AD9832 is a low-cost, complete direct digital synthesizer (DDS) on a chip, with 25- MHz clock speed and 10-bit resolution. It includes a phase accumulator, sine lookup table, and on-chip D/A converter to generate an output sine wave with an SFDR of 72 dBc. On-chip frequency and phase registers can be used to perform modulation, such as FSK, PSK, and QPSK. Frequency accuracy can be controlled to 1 part in 4x10⁹. A serial interface is provided for loading settings and modulation signals.

Typical applications include DDS tuning and digital demodulation. Housed in a 16- pin TSSOP, it operates with a 3- or 5-V single supply, consuming 45 mW. A power-down capability (3 & 5 mW residual power with 3- & 5-V supplies) aids power conservation in battery-powered operations. Operation is from –40 to +85°C. Price in 1000s is $5.00.

RS-485 Transceivers Full-duplex ADM488, 489 are in 8-pin µSOIC, TSSOP-14
The ADM488 and ADM489 are low-power full-duplex (receive and transmit) differential line transceivers suitable for communication on multipoint bus transmission lines. Like other industry-standard devices, they meet EIA Standards RS-485 and RS-422, but with less quiescent current (37-µA IDD), greater supply tolerance (10%), and smaller packaging (TSSOP: ADM489) than is typically available in comparable devices.

In addition, their 2-kV EFT protection meets IEC1000-4-4, and EMI immunity meets IEC1000-4-3. They are short-circuit protected and have controlled slew rate for low EMI. The ADM489 is available in 14- pin DIP and SOIC, as well as 16-pin TSSOP; the ADM488 is in 8-lead plastic DIP and narrow-body SOIC. Supply voltage is +5 V; operation is from –40 to +85°C. Price (1000s) is $1.10.

µP Supervisory IC ADM1232 provides manual or Vcc-out-of-tolerance Reset
The ADM1232 is a microprocessor supervisory circuit with existing second sources. It can monitor µP supply voltage tolerance (selectable –5%, –10%); it can detect an external interrupt; and its watchdog timer determines (with selectable time delay) when the mP has locked up. The device can then respond to any of these stimuli with a direct or complementary RESET signal.

A universally required component of digital systems, typical applications of the ADM1232 are in microprocessor systems, portable equipment, computers, controllers, intelligent instruments, automotive systems, and for protection against mP failure. The ADM1232 operates at +5 V, with 500-µA maximum quiescent current drain. It is available for –40 to +85°C in 8 lead PDIP, narrow SOIC, and microSOIC, as well as 16-lead wide SOIC. Price (1000s) is $0.90.

Low-Cost SHARCs ADSP-21061 for 5 V ADSP-21061L for 3.3 V
The ADSP-21061 and ADSP-21061L are fast (up to 50 MIPS/150MFLOPS), low-cost versions of the SHARC® (super Harvard architecture computer) 32-bit floating-point processor family. Code-compatible to their kin, they differ mainly in memory (1 Mbit of on-chip SRAM vs. up to 4 Mbits), with 6 instead of 10 DMA channels and no link ports (nevertheless, up to 6 SHARCs can be used in cluster multiprocessing). They are supported by SHARC EZ-Kit Lite low-cost evaluation board and development tools—including a C compiler. Applications include prosumer audio, communications, imaging, industrial.

Housed in a 240-lead metric PQFP, for 0 to +85°C, peak performances of 100/120/150 MFLOPS are available at 33/40/50 MIPS. Prices in 1000s for the ADSP-21061 and L start at $64/$39. The EZ-Kit Lite is $179.

CCD/CIS Processor 10-bit AD9805 is complete 1-chip CCD imaging front end
The AD9805, like the pin-compatible 12- bit AD9807 (Analog Dialogue 31-1, p. 19), is a complete single-chip analog front end (AFE) for converting outputs from CCD (charge-coupled device) and CIS (contact image sensor) modules to digital data. It requires no external active circuitry, just a few capacitors. Typical applications are in scanners and other CCD signal-processing applications, such as digital cameras.

It includes a 10-bit, 6-MSPS A/D converter, an integrated triple-correlated double sampler, programmable-gain amplifiers, pixel rate digital gain and offset adjustments, an internal voltage reference, and a µP-compatible control interface. It uses a 5-V supply (500 mW) and is compatible with 3.3- and 5-V digital I/O. Specified for 0 to +70°C, it is packaged in a 64-pin PQFP. Price (1000s) is $9.50

CCD Processor For electronic cameras: 10- bit 18-MSPS full speed CDS
The AD9801 is a complete CCD signal processor developed for electronic cameras. It is well-suited for both video conferencing and consumer-level still camera applications. Its signal-processing chain comprises a high-speed (18-MSPS) correlated double sampler (CDS), a low noise, wideband variable-gain amplifier (0 to 31.5 dB, linear in dB), and a 10-bit, 18-MSPS A/D converter (±0.5-LSB DNL, no-missing-codes guaranteed). Also included are an on-chip voltage reference and the required clamping circuitry for simple ac coupling. Digital output control is 3-state.

The AD9801 operates from a single +3-V supply and typically consumes 185 mW (15 µW in power-down mode). It is packaged in space-saving 48-pin TQFP and specified for an operating temperature range of 0 to +70°C. Price is $8.50 (1000s).

Regulator Controller ADP3310 is a low-noise high precision LDO in 8-pin SOIC
The ADP3310 is a precision voltage-regulator controller that can be used with an external power PMOS device, such as the NDP6020P, to form a two-chip low-dropout linear regulator with only 70 mV of dropout voltage at 1 A. Its low headroom, low quiescent current (800 mA), and low shutdown current (1 µA) help prolong battery life in battery-powered systems. Its accuracy spec is ± 1.5% over line, load, and temperature. Handling up to 10 A of current, it is stable with 10-µF output capacitance.

Protection includes an internal gate-to source clamp, and current limiting, with foldback. Operating voltage is from +2.5 to +15 V. It is packaged in an 8-lead SOIC and has a – 40 to +85°C ambient temperature range. 4 fixed output options are available: 1.8, 3, 3.3, & 5 V. Price (1000s) is $0.94.

AC Motor Controller Single-chip ADMC330 joins DSP & MC peripherals
The ADMC330 is a low-cost single-chip controller comprising a 20-MIPS ADSP-2171 core (with on-chip RAM and ROM) and the necessary motor-control peripherals, including a 3-phase center-based PWM generator, a seven-channel (3 independent, 4´1 multiplexed) slope/comparator ADC, 8 bits of digital I/O, etc. It is used for ac motor control in domestic appliances, industrial machinery, electric vehicles, and wherever else electric motors must be controlled.

On a single chip, the DSP performs all the necessary calculations required for closed-, open-, or servoloop motor control; and the motor-control peripherals initiate the appropriate PWM waveforms—all with little external circuitry and software overhead. The ADMC330, in an 80-lead TQFP, uses +5 V, operates from –40 to +85°C. Price is $13.60 (1000s). An evaluation kit is $395.

LD Regulators 50/200-mA ADP3300/3303 use any type quality capacitor
The ADP3300 and ADP3303 are anyCAP™ low-dropout linear regulators with wide input voltage range (3.2 to 12 V) , high accuracy (± 0.8% @ 25°C), and low dropout voltage. The 50-mA ADP3300, with dropout voltage of 80 mV, is housed in a tiny SOT23-6 package; and the 200-mA ADP3303 (180 mV) inhabits an efficient thermally enhanced SO-8 package. Both devices offer a range of optional regulated output voltages: 2.7, 3.0, 3.2, 3.3. and 5.0 V.

Both devices are stable with a wide range of capacitor values (>/¡0.47 uF), types, and ESRs (anyCAP™). Both have low noise, dropout detector, current- and thermal limiting, and 1-mA shutdown current. The ADP3300 operates from –40 to +85°C, the ADP3303 from–20 to+85°C ambient. Their respective prices are $0.86 and $1.14 in 1000s.

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