AD7665| Datasheet

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FEATURES Throughput 570 kSPS (Warp Mode) 500 kSPS (Normal Mode) INL: 2.5 LSB Max ( 0.0038% of Full Scale) 16-Bit Resolution with No Missing Codes S/(N+D): 90 dB Typ @ 180 kHz THD: 100 dB Typ @ 180 kHz Analog Input Voltage Ranges Bipolar: 10 V, 5 V, 2.5 V Unipolar: 0 V to 10 V, 0 V to 5 V, 0 V to 2.5 V Both AC and DC Specifications No Pipeline Delay Parallel (8/16 Bits) and Serial 5 V/3 V Interface SPI /QSPITM/MICROWIRETM/DSP Compatible Single 5 V Supply Operation Power Dissipation 64 mW Typical 15 W @ 100 SPS Power-Down Mode: 7 W Max Package: 48-Lead Quad Flatpack (LQFP) Package: 48-Lead Chip Scale (LFCSP) Pin-to-Pin Compatible Upgrade of the AD7664/AD7663 APPLICATIONS Data Acquisition Communication Instrumentation Spectrum Analysis Medical Instruments Process Control GENERAL DESCRIPTION
IND(4R) INC(4R) INB(2R) INA(R) INGND

16-Bit, 570 kSPS CMOS ADC AD7665*
FUNCTIONAL BLOCK DIAGRAM
AVDD AGND REF REFGND 4R 4R 2R R SWITCHED CAP DAC PARALLEL 16 INTERFACE PD RESET CLOCK CONTROL LOGIC AND CALIBRATION CIRCUITRY DVDD DGND

AD7665
SERIAL PORT

OVDD OGND

SER/PAR BUSY D[15:0] CS RD OB/2C BYTESWAP

WARP

IMPULSE

CNVST

PulSAR Selection

Type/kSPS Pseudo Differential True Bipolar True Differential 18-Bit Simultaneous/ Multichannel

100 250 AD7660 AD7663 AD7675 AD7678

500 570 AD7650 AD7664 AD7665 AD7676 AD7673 AD7654

800 1000

AD7671 AD7677 AD7674 AD7665

The AD7665 is a 16-bit, 570 kSPS, charge redistribution SAR, analog-to-digital converter that operates from a single 5 V power supply. It contains a high speed 16-bit sampling ADC, a resistor input scaler that allows various input ranges, an internal conversion clock, error correction circuits, and both serial and parallel system interface ports. The AD7665 is hardware factory-calibrated and is comprehensively tested to ensure such ac parameters as signal-to-noise ratio (SNR) and total harmonic distortion (THD), in addition to the more traditional dc parameters of gain, offset, and linearity. It features a very high sampling rate mode (Warp), a fast mode (Normal) for asynchronous conversion rate applications, and for low power applications, a reduced power mode (Impulse) where the power is scaled with the throughput.
*Patent pending

It is fabricated using Analog Devices' high performance, 0.6 micron CMOS process and is available in a 48-lead LQFP and a tiny 48-lead LFCSP with operation specified from 40 C to +85 C.
PRODUCT HIGHLIGHTS

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1. Fast Throughput The AD7665 is a very high speed (570 kSPS in Warp Mode and 500 kSPS in Normal Mode), charge redistribution, 16-bit SAR ADC. 2. Single-Supply Operation The AD7665 operates from a single 5 V supply, dissipates only 64 mW typical, even lower when a reduced throughput is used with the reduced power mode (Impulse) and a powerdown mode. 3. Superior INL The AD7665 has a maximum integral nonlinearity of 2.5 LSB with no missing 16-bit code. 4. Serial or Parallel Interface Versatile parallel (8 bits or 16 bits) or 2-wire serial interface arrangement compatible with both 3 V or 5 V logic.