Datasheet AD7691-EP (Analog Devices)

18-Bit, 250 kSPS PulSAR Differential ADC in MSOP Enhanced Product AD7691-EP FEATURES APPLICATION DIAGRAM 18-bit resolution with no missing codes +0.5V TO VDD +2.5V TO +5V Throughput: 250 kSPS INL ±0.75 LSB typical REF VDD VIO +1.8V TO VDD ±1.5 LSB minimum/maximum at −40°C to +85°C IN+ SDI SCK 3- OR 4-WIRE −2.7 LSB/+2 LSB minimum/maximum at −55°C to +105°C ±10V, ±5V, ... INTERFACE IN– SDO (SPI, DAISY CHAIN, CS) Dynamic range: 102 dB typical GND CNV ADA4941 Oversampled dynamic range: 125 dB at 1 kSPS
001 6-
Noise-free code resolution: 20 bits at 1 kSPS AD7691-EP
215 1
Effective resolution: 22.7 bits at 1 kSPS
Figure 1.
SINAD: 101 dB typical at fIN = 1 kHz, VREF = 5 V GENERAL DESCRIPTION THD: −125 dB typical at fIN = 1 kHz, VREF = 5 V
The AD7691-EP is an 18-bit, charge redistribution, successive
True differential analog input range: ±VREF
approximation, analog-to-digital converter (ADC) that operates
0 V to VREF with VREF up to VDD on both inputs
from a single power supply, VDD, between 2.3 V and 5 V. It
No pipeline delay
contains a low power, high speed, 18-bit sampling ADC with
Single-supply 2.3 V to 5 V operation with 1.8 V/2.5 V/3 V/5 V
no missing codes, an internal conversion clock, and a versatile
logic interface
serial interface port. On the CNV rising edge, it samples the
Serial interface SPI-/QSPI™-/MICROWIRE™-/DSP-compatible
voltage difference between the IN+ and IN− pins. The voltages
Ability to daisy-chain multiple ADCs
on these pins swing in opposite phases between 0 V and REF.
Optional busy indicator feature Power dissipation
The reference voltage, REF, is applied externally and can be set
1.35 mW at VDD = 2.5 V, 100 kSPS throughput
up to the supply voltage.
4.24 mW at VDD = 5 V, 100 kSPS throughput
The power of the AD7691-EP scales linearly with throughput.
1.4 μW at VDD = 2.5 V, 100 SPS throughput
The SPI-compatible serial interface also features the ability, using
Standby current: 1 nA 10-lead MSOP
the SDI input, to daisy-chain several ADCs on a single 3-wire
Pin-for-pin compatible with the18-bit AD7690 and 16-bit
bus and provides an optional busy indicator. It is compatible with
AD7693, AD7688, and AD7687
1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate VIO supply. The AD7691-EP is housed in a 10-lead MSOP with operation
ENHANCED PRODUCT FEATURES
specified from −55°C to +105°C. Additional application and
Supports defense and aerospace applications (AQEC standard)
technical information can be found in the AD7691 data sheet.
Military temperature range: −55°C to +105°C 1.5 Controlled manufacturing baseline POSITIVE INL = 0.43LSB NEGATIVE INL = –0.62LSB One assembly/test site 1.0 One fabrication site Enhanced product change notification 0.5 Qualification data available on request ) B S APPLICATIONS L ( 0 L Battery-powered equipment IN Data acquisitions –0.5 Seismic data acquisition systems Instrumentation –1.0 Medical instruments –1.5 0 65536 131072 196608 262144
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56
CODE
121 Figure 2. Integral Nonlinearity vs. Code, 5 V
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