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
-025 56
CODE
121 Figure 2. Integral Nonlinearity vs. Code, 5 V
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Document Outline Features Enhanced Product Features Applications Application Diagram General Description Table of Contents Revision History Specifications Timing Specifications Timing Diagrams Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Outline Dimensions Ordering Guide