Datasheet AD7687 (Analog Devices)

16-Bit, 1.5 LSB INL, 250 kSPS PulSAR Differential ADC in MSOP Data Sheet AD7687 FEATURES TYPICAL APPLICATION CIRCUIT 16-bit resolution with no missing codes 0.5V TO 5V 2.5 TO 5V Throughput: 250 kSPS INL: ±0.4 LSB typ, ±1.5 LSB max (±23 ppm of FSR) VREF Dynamic range: 96.5 dB REF VDD VIO 1.8V TO VDD 0 SNR: 95.5 dB at 20 kHz SDI IN+ AD7687 SCK 3- OR 4-WIRE INTERFACE THD: −118 dB at 20 kHz IN– SDO (SPI, DAISY CHAIN, CS) True differential analog input range VREF GND CNV ±V 0 REF
002
0 V to VREF with VREF up to VDD on both inputs
02972-
No pipeline delay
Figure 1.
Single-supply 2.3 V to 5.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface Proprietary serial interface: SPI/QSPI™/MICROWIRE/DSP compatible Daisy-chain multiple ADCs and BUSY indicator Power dissipation 1.35 mW at 2.5 V/100 kSPS, 4 mW at 5 V/100 kSPS, and 1.4 μW at 2.5 V/100 SPS Standby current: 1 nA 10-lead MSOP and 10-lead, 3 mm × 3 mm LFCSP Pin-for-pin compatible with AD7685, AD7686, and AD7688 APPLICATIONS Battery-powered equipment Data acquisitions Instrumentation Medical instruments Process controls GENERAL DESCRIPTION
The AD76871 is a 16-bit, charge redistribution, successive The SPI-compatible serial interface also features the ability to approximation, analog-to-digital converter (ADC) that operates daisy-chain several ADCs on a single 3-wire bus and provides from a single power supply, VDD, between 2.3 V to 5.5 V. It an optional BUSY indicator by means of the SDI pin. It is contains a low power, high speed, 16-bit sampling ADC with no compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic using the separate missing codes, an internal conversion clock, and a versatile supply VIO. serial interface port. The device also contains a low noise, wide The AD7687 comes in a 10-lead MSOP or a 10-lead LFCSP bandwidth, short aperture delay track-and-hold circuit. On the with operation specified from −40°C to +85°C. CNV rising edge, the AD7687 the samples the voltage difference between IN+ and IN− pins, which can range from −VREF to +VREF.
Table 1. MSOP, LFCSP/SOT-23 16-Bit PulSAR® ADC
The reference voltage, VREF, is applied externally and can be set
Type 100 kSPS 250 kSPS 500 kSPS
up to the supply voltage. True Differential AD7684 AD7687 AD7688 The power consumption of the device scales linearly with Pseudo AD7683 AD7685 AD7686 throughput. Differential/Unipolar AD7694 Unipolar AD7680 1 Protected by U.S. Patent 6,703,961.
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Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS Timing Diagrams ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER OPERATION Transfer Functions TYPICAL CONNECTION DIAGRAM ANALOG INPUT DRIVER AMPLIFIER CHOICE SINGLE-TO-DIFFERENTIAL DRIVER VOLTAGE REFERENCE INPUT POWER SUPPLY SUPPLYING THE ADC FROM THE REFERENCE DIGITAL INTERFACE CS\ MODE, 3-WIRE WITHOUT BUSY INDICATOR CS\ MODE, 3-WIRE WITH BUSY INDICATOR CS\ MODE, 4-WIRE WITHOUT BUSY INDICATOR CS\ MODE, 4-WIRE WITH BUSY INDICATOR CHAIN MODE WITHOUT BUSY INDICATOR CHAIN MODE WITH BUSY INDICATOR APPLICATIONS INFORMATION LAYOUT EVALUATING THE PERFORMANCE OF THE AD7687 OUTLINE DIMENSIONS ORDERING GUIDE