參數(shù)資料
型號(hào)： AD7691BRMZ-RL7
廠商： ANALOG DEVICES INC
元件分類(lèi)： ADC
英文描述： 18-Bit, 1.5 LSB INL, 250 kSPS PulSAR Differential ADC in MSOP/QFN
中文描述： 1-CH 18-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO10
封裝： LEAD FREE, MO-187BA, MSOP-10
文件頁(yè)數(shù)： 1/28頁(yè)
文件大?。?/td> 682K
代理商： AD7691BRMZ-RL7
18-Bit, 1.5 LSB INL, 250 kSPS PulSAR
Differential ADC in MSOP/QFN
AD7691
FEATURES
18-bit resolution with no missing codes
Throughput: 250 kSPS
INL: ±0.75 LSB typ, ±1.5 LSB max (±6 ppm of FSR)
Dynamic range: 102 dB typ @ 250 kSPS
Oversampled dynamic range: 125 dB @1 kSPS
Noise-free code resolution: 20 bits @ 1 kSPS
Effective resolution: 22.7 bits @ 1 kSPS
SINAD: 101.5 dB typ @ 1 kHz
THD: 125 dB typ @ 1 kHz
True differential analog input range: ±V
REF
0 V to V
REF
with V
REF
up to VDD on both inputs
No pipeline delay
Single-supply 2.3 V to 5 V operation with
1.8 V/2.5 V/3 V/5 V logic interface
Serial interface SPI/QSPI/MICROWIRE/DSP compatible
Daisy-chain multiple ADCs and busy indicator
Power dissipation
5 mW @ 5 V/250 kSPS
50 μW @ 5 V/1 kSPS
Standby current: 1 nA
10-lead package: MSOP (MSOP-8 size) and
3 mm × 3 mm QFN
1
(LFCSP) (SOT-23 size)
Pin-for-pin compatible with the18-bit AD7690 and 16-bit
AD7693, AD7688, and AD7687
APPLICATIONS
Battery-powered equipment
Data acquisitions
Seismic data acquisition systems
DVMs
Instrumentation
Medical instruments
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
2006 Analog Devices, Inc. All rights reserved.
www.analog.com
1.5
–1.5
0
262144
CODE
I
1.0
0.5
0
–0.5
–1.0
65536
131072
196608
POSITIVE INL = 0.43LSB
0
Figure 1. Integral Nonlinearity vs. Code, 5 V
APPLICATION DIAGRAM
AD7691
REF
GND
VDD
IN+
IN–
VIO
SDI
SCK
SDO
CNV
+1.8V TO VDD
3- OR 4-WIRE
+2.3V TO VDD
±10V, ±5V, ...
+2.3V TO +5V
ADA4941
0
Figure 2.
Table 1. MSOP, QFN
1
(LFCSP)/SOT-23
14-/16-/18-Bit PulSAR ADC
Type
18-Bit
100
kSPS
250
kSPS
AD7691
400 kSPS
to
500
kSPS
AD7690
ADC
Driver
ADA4941-1
ADA4841-x
ADA4941-1
ADA4841-x
ADA4841-x
16-Bit True
Differential
16-Bit Pseudo
Differential/
Unipolar
14-Bit
1
QFN package in development. Contact sales for samples and availability.
GENERAL DESCRIPTION
AD7684
AD7687
AD7688
AD7693
AD7686
AD7683
AD7680
AD7685
AD7694
AD7940
AD7942
AD7946
ADA4841-x
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.
Its 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
1
(LFCSP) with operation specified from 40°C to +85°C.
1
QFN package in development. Contact sales for samples and availability.
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