AD7691 Series

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

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

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

Part	Operating Temperature (Min)	Operating Temperature (Max)	Configuration	Ratio - ADC	Ratio - S/H	Input Type	Number of Bits	Sampling Rate (Per Second)	Number of A/D Converters	Number of Inputs	Data Interface	Package Length	Package Name	Package Width	Voltage - Supply, Digital (Max)	Voltage - Supply, Digital (Min)	Architecture	Reference Type	Mounting Type	Voltage - Supply, Analog (Min)	Voltage - Supply, Analog (Max)	Package / Case
Analog Devices Inc./Maxim Integrated AD7691BRMZ	-40 °C	85 °C	S/H-ADC	1	1	Differential	18 bits	250 kHz	1 count	1	DSP SPI	0.118 in	10-MSOP 10-TFSOP	3 mm	5.5 V	2.3 V	SAR	External	Surface Mount	2.3 V	5.5 V
Analog Devices Inc./Maxim Integrated AD7691BCPZRL7	-40 °C	85 °C	S/H-ADC	1	1	Differential	18 bits	250 kHz	1 count	1	DSP SPI	3 mm	10-LFCSP-WD	3 mm	5.5 V	2.3 V	SAR	External	Surface Mount	2.3 V	5.5 V	10-VFDFN Exposed Pad CSP
Analog Devices Inc./Maxim Integrated AD7691SRMZ-EP-RL7	-55 °C	105 °C	ADC			Differential	18 bits	250 kHz	1 count	1	DSP SPI	0.118 in	10-MSOP 10-TFSOP	3 mm	5.25 V	1.8 V	SAR	External	Surface Mount	2.3 V	5.25 V
Analog Devices Inc./Maxim Integrated AD7691BRMZ-RL7	-40 °C	85 °C	S/H-ADC	1	1	Differential	18 bits	250 kHz	1 count	1	DSP SPI	0.118 in	10-MSOP 10-TFSOP	3 mm	5.5 V	2.3 V	SAR	External	Surface Mount	2.3 V	5.5 V

Catalog

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

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