AD7694 Analog Devices, AD7694 Datasheet

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AD7694

Manufacturer Part Number
AD7694
Description
Manufacturer
Analog Devices
Datasheet

Specifications of AD7694

Resolution (bits)
16bit
# Chan
1
Sample Rate
250kSPS
Interface
Ser,SPI
Analog Input Type
Diff-Uni
Ain Range
(Vref) p-p,Uni (Vref)
Adc Architecture
SAR
Pkg Type
SOP

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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:
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,
Standby current: 1 nA
8-lead MSOP package
Improved second source to LTC1864 and LTC1864L
APPLICATIONS
Battery-powered equipment
Data acquisition
Instrumentation
Medical instruments
Process control
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. A
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.
0 V to V
800 μA @ 5 V/100 kSPS
REF
with V
REF
up to VDD
16-Bit, 250 kSPS PulSAR
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Table 1. MSOP, LFCSP (QFN)/SOT-23, 16-Bit PulSAR ADC
Type
True Differential
Pseudo
Differential/Unipolar
Unipolar
0 TO V
REF
APPLICATION DIAGRAM
© 2005 Analog Devices, Inc. All rights reserved.
IN+
IN–
1V TO VDD
100 kSPS
AD7684
AD7683
AD7680
AD7694
GND
REF
Figure 1.
®
2.5V TO 5V
SDO
VDD
SCK
CNV
ADC in MSOP
250 kSPS
AD7687
AD7685
AD7694
AD7694
3-WIRE SPI
INTERFACE
www.analog.com
500 kSPS
AD7688
AD7686

Related parts for AD7694

AD7694 Summary of contents

Page 1

... 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. A 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 ...

Page 2

... Application Information................................................................ 12 Circuit Information.................................................................... 12 REVISION HISTORY 5/05—Rev Rev. A Updated Format..................................................................Universal Changes to Digital Interface Section............................................ 14 Changes to Figure 25...................................................................... 15 Changes to Evaluating the AD7694’s Performance Section...... 15 7/04—Revision 0: Initial Version Converter Operation.................................................................. 12 Transfer Functions ..................................................................... 12 Typical Connection Diagram ................................................... 13 Analog Input ............................................................................... 13 Driver Amplifier Choice ........................................................... 13 Voltage Reference Input ...

Page 3

... See the Analog Input section 16 +6 −4 +4 0.5 ±30 ±2 ±15 ±0.3 ±3.5 ±0.7 ±3.5 ±0.3 ±0.05 250 0 250 150 0 150 −106 −106 AD7694 Unit Bits Bits LSB LSB LSB ppm/°C mV ppm/°C LSB kSPS kSPS ...

Page 4

... AD7694 VDD = 2 5. VDD; T REF A Table 3. Parameter Conditions REFERENCE Voltage Range Load Current 250 kSPS, V SAMPLING DYNAMICS −3 dB Input Bandwidth DIGITAL INPUTS Logic Levels V VDD = 4. VDD = 2 VDD = 5. VDD = 3 DIGITAL OUTPUTS Data Format Pipeline Delay +500 μA ...

Page 5

... DSDO DIS Symbol Min t CONV t 6.66 CYC t 125 SCK t 50 SCKL t 50 SCKH t 5 HSDO t DSDO DIS Rev Page AD7694 Typ Max Unit 3.2 μs μ Typ Max Unit 4.66 μs μ 120 ns ...

Page 6

... AD7694 ABSOLUTE MAXIMUM RATINGS Table 6. Parameter Rating Analog Inputs 1 1 IN+ , IN− GND − 0 VDD + 0 ±130 mA REF GND − 0 VDD + 0.3 V Supply Voltages VDD to GND −0 Digital Inputs to GND −0 VDD + 0.3 V Digital Outputs to GND −0 VDD + 0.3 V Storage Temperature Range − ...

Page 7

... Serial Data Clock Input. When CNV is low, the conversion result is shifted out by this clock. 8 VDD P Power Supply analog input digital input digital output; and P = power. REF VDD 1 8 AD7694 IN+ SCK 2 7 TOP VIEW IN– SDO 3 6 (Not to Scale) GND CNV 4 5 Figure 4. 8-Lead MSOP Pin Configuration . REF Rev Page AD7694 ...

Page 8

... AD7694 TERMINOLOGY Integral Nonlinearity Error (INL) Linearity error refers to the deviation of each individual code from a line drawn from negative full scale to positive full scale. The point used as negative full scale occurs ½ LSB before the first code transition. Positive full scale is defined as a level 1 ½ ...

Page 9

... CODE IN HEX Figure 9. Histogram Input at the Code Center 0 16384 POINT FFT VDD = REF = 2.5V – 150kSPS 20.43kHz IN –40 SNR = 88.5dB THD = –102.7dB SFDR = –105.1dB –60 – FREQUENCY (kHz) Figure 10. FFT Plot AD7694 65536 ...

Page 10

... AD7694 100 95 SNR 90 ENOB S/[N+ 2.5 3.0 3.5 4.0 REFERENCE VOLTAGE (V) Figure 11. SNR, S/(N + D), and ENOB vs. Reference Voltage 100 2.5V, –1dB REF 100 FREQUENCY (kHz) Figure 12. S/[ vs. Frequency –80 –85 –90 – 5V, –1dB REF –100 –105 –110 –115 120 FREQUENCY (kHz) Figure 13 ...

Page 11

... OFFSET ERROR 0 –2 GAIN ERROR –4 –6 –55 –35 – TEMPERATURE (°C) Figure 17. Offset and Gain Error vs. Temperature 105 125 Rev Page AD7694 ...

Page 12

... The AD7694 provides the user with on-chip, track-and-hold and does not exhibit any pipeline delay or latency, making it ideal for multiple, multiplexed channel applications. The AD7694 is specified from 2 5. housed in an 8-lead MSOP. The AD7694 is an improved second source to LTC1864 and LTC1864L. For even better performance, the AD7685 should be considered ...

Page 13

... Figure 20 shows an example of the recommended application diagram for the AD7694. ANALOG INPUT Figure 21 shows an equivalent circuit of the AD7694 input structure. The two diodes, D1 and D2, provide ESD protection for the analog inputs, IN+ and IN−. Care must be taken to ensure that the analog input signal never exceeds the supply rails by more than 0 ...

Page 14

... Small, low power, and low frequency AD8031 High frequency and low power VOLTAGE REFERENCE INPUT The AD7694 voltage reference input, REF, has a dynamic input impedance and should therefore be driven by a low impedance source with efficient decoupling between the REF and GND pins, as explained in the Layout section. ...

Page 15

... The printed circuit board that houses the AD7694 should be designed so that the analog and digital sections are separated and confined to certain areas of the board. The pinout of the AD7694 with all its analog signals on the left side and all its digital signals on the right side eases this task. t ...

Page 16

... Integral Model Nonlinearity AD7694ARM ±6 LSB max AD7694ARMRL7 ±6 LSB max AD7694BRM ±4 LSB max AD7694BRMRL7 ±4 LSB max 1 EVAL-AD7694CB 2 EVAL-CONTROL BRD2 2 EVAL-CONTROL BRD3 1 This board can be used as a standalone evaluation board or in conjunction with the EVAL-CONTROL BRDx for evaluation/demonstration purposes. ...

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