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AD7631 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD7631
Beschreibung (AD7631 / AD7634) 18-Bit 250/670 kSPS PulSAR Bipolar Programmable Inputs ADC
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 14 Seiten
AD7631 Datasheet, Funktion
www.DataSheet4U.com
Preliminary Technical Data
18-Bit 250/670 kSPS PulSAR®
Bipolar Programmable Inputs ADC
AD7631/AD7634
FEATURES
Multiple pins/software programmable input ranges:
±10V, ±5V, 10V, 5V
iCMOS™ process technology
Pins or serial SPI input ranges/mode selection
Throughput:
670kSPS (AD7634)
250kSPS (AD7631)
INL: ± 1.75 LSB (7± ppm of full scale)
DNL: +2/-1 LSB
18-bit resolution with no missing codes
Dynamic range: 102.5 dB typical
SNR: 101 dB typical
THD: -122 dB typical
5V internal reference: typical drift 7ppm/°C; TEMP output
No pipeline delay (SAR architecture)
Parallel (18, 16- or 8-bit bus) and serial 5 V/3.3 V interface
SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
Power dissipation:
190 mW @ 670kSPS
75 mW @ 250kSPS
Pb-free 48-lead LQFP and LFCSP (7x7mm) packages
Pin compatible with other PulSAR ADCs
APPLICATIONS
Process control
High speed data acquisition
Digital signal processing
Spectrum analysis
Instrumentation
Communications
GENERAL DESCRIPTION
The AD7631/AD7634 is an18-bit, charge redistribution
successive approximation register (SAR) architecture analog-to-
digital converter (ADC) with programmable input ranges and
mode selection via a dedicated write only serial interface (or by
hardware pin-strapping). The device is fabricated on ADI’s
patented iCMOS high voltage process. The device contains a
high speed 18-bit sampling ADC, an internal conversion clock,
an internal reference (and buffer), and both serial and parallel
system interface ports. Power consumption is automatically
scaled with throughput (AD7634 in Impulse mode), making it
ideal for battery-powered applications. It is available in Pb-free,
48-lead packages with operation specified from −40°C to
+85°C.
Rev. PrC
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
FUNCTIONAL BLOCK DIAGRAM
TEMP REFBUFIN REF REFGND VCC VEE
DVDD DGND
AGND
AVDD
IN+
IN-
REF
REF AMP
SWITCHED
CAP DAC
PDREF
PDBUF
PD
RESET
CLOCK
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
AD7631/
AD7634
SERIAL
PROGRAMMABLE
PORT
SERIAL DATA
PORT
18
PARALLEL
INTERFACE
OVDD
OGND
SPPEN
SPPCLK
SPPDATA
HW/SW
D[17:0]
BUSY
RD
CS
D0/OB/2C
CNVST WARP IMPULSE
MODE0 MODE1
Figure 1.
Table 1. PulSAR® Selection
Type/kSPS
100 to
250
Pseudo
Differential
AD7651,
AD7660
AD7661
True Bipolar
True
Differential
AD7610,
AD7663
AD7675
500 to
570
AD7650
AD7652
AD7664
AD7666
AD7665
AD7676
18-Bit
Multichannel/
Simultaneous
AD7631
AD7678
AD7679
AD7654
AD7655
650 to
1000
AD7653
AD7667
>1000
AD7612,
AD7671
AD7677
AD7634
AD7674
AD7621
AD7622
AD7623
AD7641
AD7643
PRODUCT HIGHLIGHTS
1. Programmable input range and mode selection.
Dedicated write only serial port used for selecting input
range and mode select (mode select AD7634 only).
2. Fast throughput
The AD7634 is 670kSPS and the AD7631 is 250kSPS.
3. Superior Linearity.
No missing 18-bit code. +/- 1.75 LSB typical INL
4. Internal Reference.
5 V internal reference with a typical drift of ±7 ppm/°C
and on-chip TEMP sensor.
5. Serial or Parallel Interface.
Versatile parallel (18, 16- or 8-bit bus) or 2-wire serial
interface arrangement compatible with 3.3 V, or 5 V logic.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.






AD7631 Datasheet, Funktion
AD7631/AD7634
Preliminary Technical Data
TIMING SPECIFICATIONS
AVDD = DVDD = 5 V; OVDD = 2.7 V to 5.5 V; VCC = 15V; VEE = -15V; VREF = 5 V; all specifications TMIN to TMAX, unless otherwise noted.
Table 3.
Parameter
Symbol Min
Typ Max Unit
CONVERSION AND RESET
Convert Pulse Width
Time Between Conversions (Warp Mode/Normal Mode1)
AD7631
AD7634 (Warp Mode/Normal Mode/Impulse Mode)2
t1 10
t2
4
1.49/1.75/2.22
ns
ns
μs
μs
CNVST Low to BUSY High Delay
BUSY High All Modes (Except Master Serial Read After Convert)
AD7631
t3
t4
35 ns
TBD μs
AD7634 (Warp Mode/Normal Mode/Impulse Mode)
TBD μs
Aperture Delay
End of Conversion to BUSY Low Delay
Conversion Time
AD7631
t5
t6 10
t7
2 ns
ns
TBD μs
AD7634 (Warp Mode/Normal Mode/Impulse Mode)
TBD μs
Acquisition Time
AD7631
t8
250
ns
AD7634 (Warp Mode/Normal Mode/Impulse Mode)
250
ns
RESET Pulse Width
PARALLEL INTERFACE MODES
CNVST Low to DATA Valid Delay
AD7631
t9 10
t10
ns
1.5 μs
AD7634 (Warp Mode/Normal Mode/Impulse Mode)
1/1.25/1.5 μs
DATA Valid to BUSY Low Delay
Bus Access Request to DATA Valid
Bus Relinquish Time
MASTER SERIAL INTERFACE MODES3
CS Low to SYNC Valid Delay
CS Low to Internal SCLK Valid Delay
CS Low to SDOUT Delay
CNVST Low to SYNC Delay
AD7631
t11 12
t12
t13 5
t14
t15
t16
t17
ns
45 ns
15 ns
10 ns
10 ns
10 ns
525 ns
AD7634 (Warp Mode/Normal Mode/Impulse Mode)
25/275/525
ns
SYNC Asserted to SCLK First Edge Delay
Internal SCLK Period4
Internal SCLK High4
Internal SCLK Low4
SDOUT Valid Setup Time4
SDOUT Valid Hold Time4
SCLK Last Edge to SYNC Delay4
CS High to SYNC HI-Z
CS High to Internal SCLK HI-Z
CS High to SDOUT HI-Z
t18 3
t19 25
t20 12
t21 7
t22 4
t23 2
t24 3
t25
t26
t27
ns
40 ns
ns
ns
ns
ns
ns
10 ns
10 ns
10 ns
Rev. PrC | Page 6 of 14

6 Page









AD7631 pdf, datenblatt
AD7631/AD7634
Preliminary Technical Data
Pin
No. Mnemonic
38 REFGND
39 IN−
40 VCC
41 VEE
43 IN+
45 TEMP
46 REFBUFIN
47 PDREF
48 PDBUF
Type 1
AI
AI
P
P
AI
AO
AI/O
DI
DI
Description
Reference Input Analog Ground.
Differential Negative Analog Input; referenced to IN+.
High Voltage Positive Supply.
High Voltage Negative Supply.
Differential Positive Analog Input; referenced to IN-.
Temperature Sensor Analog Output.
Reference Buffer Input.
When using an external reference with the internal buffer (PDBUF = low, PDREF = high), applying 2.5V
on this pin produces 5V on the REF pin.
When using the internal reference (PDBUF = PDREF = low), this pin should not be connected.
Internal Reference Power-Down Input.
When low, the internal reference is enabled (PDBUF also needs to be low).
When high, the internal reference is powered down and an external reference must been used.
Internal Reference Buffer Power-Down Input.
When low, the buffer is enabled (PDREF also needs to be low).
When high, the buffer is powered-down and an external reference must be used.
1 AI = analog input; AI/O = bidirectional analog; AO = analog output; DI = digital input; DI/O = bidirectional digital; DO = digital output; P = power.
Table 7. Data Bus Interface Definition
MODE MODE1 MODE0 D0/OB/2C
0 0 0 R[0]
1 0 1 OB/2C
1 0 1 OB/2C
2 1 0 OB/2C
2 1 0 OB/2C
2 1 0 OB/2C
2 1 0 OB/2C
3 1 1 OB/2C
D1/A0 D2/A1
R[1] R[2]
A0 = 0 R[2]
A0 = 1 R[0]
A0 = 0 A1 = 0
A0 = 0 A1 = 1
A0 = 1 A1 = 0
A0 = 1 A1 = 1
All Hi-Z
D[3] D[4:9]
R[3] R[4:9]
R[3] R[4:9]
R[1]
All Hi-Z
All Hi-Z
All Hi-Z
All Hi-Z
D[10:11] D[12:15] D[16:17]
R[10:11] R[12:15] R[16:17]
R[10:11] R[12:15] R[16:17]
All Zeros
R[10:11] R[12:15] R[16:17]
R[2:3]
R[4:7]
R[8:9]
R[0:1]
All Zeros
All Zeros
R[0:1]
Serial Interface
Description
18-Bit Parallel
16-Bit High Word
16-Bit Low Word
8-Bit High Byte
8-Bit Mid Byte
8-Bit Low Byte
8-Bit Low Byte
Serial Interface
Table 8. Input Range Selection. Parallel Mode and Serial Hardware Mode
Range
BIP
TEN HW/SW (serial
mode)
0 - 5V
Low
Low
High
0 - 10V
Low
High
High
±5V High Low
High
±10V
High
High
High
All Ranges1
X
X
Low
1 In serial mode (MODE[1:0] = 3) when HW/SW = low, the input ranges are defined by registers.
Rev. PrC | Page 12 of 14

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