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PDF AD7694 Data sheet ( Hoja de datos )
| Número de pieza | AD7694 | |
| Descripción | 250 kSPS PulSAR ADC in MSOP | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
16-bit resolution with no missing codes
Throughput: 250 kSPS @ 5 V
INL: ±4 LSB max
S/(N + D): 92 dB @ 20 kHz
THD: –106 dB @ 20 kHz
Pseudo-differential analog input range:
0 V to VREF with VREF up to VDD
No pipeline delay
Single-supply operation: 2.7 V or 5 V
Serial interface SPI®/QSPI™/MICROWIRE™/DSP-compatible
Supply Current: 540 µA @ 2.7 V/100 kSPS,
800 µA @ 5 V/100 kSPS
Standby current: 1 nA
8-lead MSOP package
Improved 2nd Source to LTC1864 and LTC1864L
APPLICATIONS
Battery-powered equipment
Data acquisition
Instrumentation
Medical instruments
Process control
16-Bit, 250 kSPS PulSAR
ADC in MSOP
AD7694
APPLICATION DIAGRAM
1V TO VDD 2.5V TO 5V
0 TO VREF
REF
VDD
IN+ AD7694 SCK
IN– SDO
GND
CNV
3-WIRE SPI
INTERFACE
Figure 1.
Table 1. MSOP, QFN (LFCSP)/SOT-23, 16-Bit PulSAR ADC
Type
100 kSPS 250 kSPS 500 kSPS
True Differential
AD7684
AD7687
AD7688
Pseudo
AD7683
Differential/Unipolar
AD7685
AD7694
AD7686
Unipolar
AD7680
GENERAL DESCRIPTION
The AD7694 is a 16-bit, charge redistribution, successive
approximation, PulSAR™ analog-to-digital converter (ADC)
that operates from a single power supply, VDD, between 2.7 V
to 5.25 V. It contains a low power, high speed, 16-bit sampling
ADC with no missing codes (B grade), an internal conversion
clock, and a serial, SPI-compatible interface port. The part also
contains a low noise, wide bandwidth, short aperture delay
track-and-hold circuit. On the CNV rising edge, it samples an
analog input, IN+, between 0 V to REF with respect to a ground
sense, IN−. The reference voltage, REF, is applied externally and
can be set up to the supply voltage.
Its power scales linearly with throughput.
The AD7694 is housed in an 8-lead MSOP package with an
operating temperature specified from −40°C to +85°C.
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.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
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TIMING SPECIFICATIONS
VDD = 4.75 V to 5.25 V; TA = −40°C to +85°C, unless otherwise stated.
Table 4.
Parameter
Conversion Time: CNV Rising Edge to Data Available
Time between Conversions
SCK Period
SCK Low Time
SCK High Time
SCK Falling Edge to Data Remains Valid
SCK Falling Edge to Data Valid Delay
CNV Low to SDO, D15 MSB Valid
CNV High to SDO High Impedance
VDD = 2.7 V to 4.75 V; TA = −40°C to +85°C, unless otherwise stated.
Table 5.
Parameter
Conversion Time: CNV Rising Edge to Data Available
Time between Conversions
SCK Period
SCK Low Time
SCK High Time
SCK Falling Edge to Data Remains Valid
SCK Falling Edge to Data Valid Delay
CNV Low to SDO, D15 MSB Valid
CNV High to SDO High Impedance
AD7694
Symbol
tCONV
tCYC
tSCK
tSCKL
tSCKH
tHSDO
tDSDO
tEN
tDIS
Min
4
50
20
20
5
Typ Max
3.2
20
60
60
Unit
µs
µs
ns
ns
ns
ns
ns
ns
ns
Symbol
tCONV
tCYC
tSCK
tSCKL
tSCKH
tHSDO
tDSDO
tEN
tDIS
Min
6.66
125
50
50
5
Typ Max
4.66
50
120
120
Unit
µs
µs
ns
ns
ns
ns
ns
ns
ns
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6
4
2
OFFSET ERROR
0
–2
GAIN ERROR
–4
–6
–55 –35 –15
5 25 45 65
TEMPERATURE (°C)
85 105 125
Figure 17. Offset and Gain Error vs. Temperature
AD7694
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