AD7691 Series

18-Bit, 1.5 LSB INL, 250kSPS PulSAR®Differential ADC in MSOP/QFN

Catalog

18-Bit, 1.5 LSB INL, 250kSPS PulSAR®Differential ADC in MSOP/QFN

Part	Configuration	Voltage - Supply, Digital [Max]	Voltage - Supply, Digital [Min]	Package / Case	Voltage - Supply, Analog [Max]	Voltage - Supply, Analog [Min]	Number of A/D Converters	Reference Type	Data Interface	Operating Temperature [Max]	Operating Temperature [Min]	Sampling Rate (Per Second)	Ratio - S/H:ADC	Supplier Device Package	Mounting Type	Input Type	Architecture	Number of Inputs	Package / Case [x]	Package / Case [x]
Analog Devices AD7691BCPZRL7	S/H-ADC	5.5 V	2.3 V	10-VFDFN Exposed Pad CSP	5.5 V	2.3 V	1	External	DSP SPI	85 °C	-40 °C	250 k	1:1	10-LFCSP-WD (3x3)	Surface Mount	Differential	SAR	1
Analog Devices AD7691SRMZ-EP-RL7	ADC	5.25 V	1.8 V	10-MSOP 10-TFSOP	5.25 V	2.3 V	1	External	DSP SPI	105 ░C	-55 °C	250 k		10-MSOP	Surface Mount	Differential	SAR	1	3 mm	0.118 in
Analog Devices AD7691BRMZ-RL7	S/H-ADC	5.5 V	2.3 V	10-MSOP 10-TFSOP	5.5 V	2.3 V	1	External	DSP SPI	85 °C	-40 °C	250 k	1:1	10-MSOP	Surface Mount	Differential	SAR	1	3 mm	0.118 in

Catalog

18-Bit, 1.5 LSB INL, 250kSPS PulSAR®Differential ADC in MSOP/QFN

Key Features

• 18-bit resolution with no missing codes

• Throughput: 250 kSPS

• INL: ±0.75 LSB typical, ±1.5 LSB maximum (±6 ppm of FSR)

• Dynamic range: 102 dB typical at 250 kSPS

• Oversampled dynamic range: 125 dB at1 kSPS

• Noise-free code resolution: 20 bits at 1 kSPS

• Effective resolution: 22.7 bits at 1 kSPS

• See data sheet for additional features

• DownloadAD7691-EP data sheet(pdf)

• Military temperature range: –55°C to +105°C

• Controlled manufacturing baseline

• One assembly/test site

• One fabrication site

• Enhanced product change notification

• Qualification data available on request

• V62/14632-01XE DSCC Drawing Number

Description

The AD7691 is an 18-bit, charge redistribution, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD, between 2.3 V and 5 V. It contains a low power, high speed, 18-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. On the CNV rising edge, it samples the voltage difference between the IN+ and IN− pins. The voltages on these pins usually swing in opposite phase between 0 V and REF. The reference voltage, REF, is applied externally and can be set up to the supply voltage.The part’s power scales linearly with throughput.The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus and provides an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate VIO supply.The AD7691 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.ApplicationsBattery-powered equipmentData acquisitionsSeismic data acquisition systemsInstrumentationMedical instruments