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参数资料
| 型号： | EVAL-AD7634EDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7634 |
| 标准包装： | 1 |
| 系列： | * |
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Data Sheet
AD7634
Rev. B | Page 11 of 32
Pin No.
Mnemonic
Type1
Description
36
BIPOLAR
Input Range Select. See description for Pin 30.
37
REF
AO/I
Reference Input/Output. When PDREF/PDBUF = low, the internal reference and buffer are enabled, produc-
ing 5 V on this pin. When PDREF/PDBUF = high, the internal reference and buffer are disabled, allowing
an externally supplied voltage reference up to AVDD volts. Decoupling with at least a 22 μF capacitor is
required with or without the internal reference and buffer. See the Voltage Reference Input/Output
section.
38
REFGND
AI
Reference Input Analog Ground. Connected to analog ground plane.
39
IN
AI
Analog Input. Referenced to IN+.
In the 0 V to 5 V input range, IN is between 0 V and VREF V centered about VREF/2. In the 0 V to 10 V
range, IN is between 0 V and 2 VREF V centered about VREF.
In the ±5 V and ±10 V ranges, IN is true bipolar up to ±2 VREF V (±5 V range) or ±4 VREF V (±10 V range)
and centered about 0 V.
In all ranges, IN must be driven 180° out of phase with IN+.
40
VCC
P
High Voltage Positive Supply. Normally 7 V to 15 V.
41
VEE
P
High Voltage Negative Supply. Normally 0 V to 15 V (0 V in unipolar ranges).
43
IN+
AI
Analog Input. Referenced to IN.
In the 0 V to 5 V input range, IN+ is between 0 V and VREF V centered about VREF /2. In the 0 V to 10 V
range, IN+ is between 0 V and 2 VREF V centered about VREF.
In the ±5 V and ±10 V ranges, IN+ is true bipolar up to ±2 VREF V (±5 V range) or ±4 VREF V (±10 V range)
and centered about 0 V.
In all ranges, IN+ must be driven 180° out of phase with IN
45
TEMP
AO
Temperature Sensor Analog Output. When the internal reference is enabled (PDREF = PDBUF = low),
this pin outputs a voltage proportional to the temperature of the AD7634. See the Voltage Reference
Input/Output section.
46
REFBUFIN
AI
Reference Buffer Input. When using an external reference with the internal reference buffer (PDBUF = low,
PDREF = high), applying 2.5 V on this pin produces 5 V on the REF pin. See the Voltage Reference
Input/Output section.
47
PDREF
DI
Internal Reference Power-Down Input.
When low, the internal reference is enabled.
When high, the internal reference is powered down, and an external reference must be used.
48
PDBUF
DI
Internal Reference Buffer Power-Down Input.
When low, the buffer is enabled (must be low when using internal reference).
When high, the buffer is powered-down.
49
EPAD3
NC
Exposed Pad. The exposed pad is not connected internally. It is recommended that the pad be
soldered to VEE.
1 AI = analog input; AI/O = bidirectional analog; AO = analog output; DI = digital input; DI/O = bidirectional digital; DO = digital output; P = power, NC = no internal
connection.
2 In serial configuration mode (MODE[1:0] = 3, HW/SW = low), this input is programmed with the serial configuration register and this pin is a don’t care. See the
Hardware Configuration section and the Software Configuration section.
3 LFCSP_VQ package only.
Table 7. Data Bus Interface Definition
MODE
MODE1
MODE0
D0/OB/2C
D1/A0
D2/A1
D[3]
D[4:9]
D[10:11]
D[12:15]
D[16:17]
Description
0
R[0]
R[1]
R[2]
R[3]
R[4:9]
R[10:11]
R[12:15]
R[16:17]
18-bit parallel
1
0
1
OB/2C
A0 = 0
R[2]
R[3]
R[4:9]
R[10:11]
R[12:15]
R[16:17]
16-bit high word
1
0
1
OB/2C
A0 = 1
R[0]
R[1]
All zeros
16-bit low word
2
1
0
OB/2C
A0 = 0
A1 = 0
All High-Z
R[10:11]
R[12:15]
R[16:17]
8-bit high byte
2
1
0
OB/2C
A0 = 0
A1 = 1
All High-Z
R[2:3]
R[4:7]
R[8:9]
8-bit midbyte
2
1
0
OB/2C
A0 = 1
A1 = 0
All High-Z
R[0:1]
All zeros
8-bit low byte
2
1
0
OB/2C
A0 = 1
A1 = 1
All High-Z
All zeros
R[0:1]
8-bit low byte
3
1
OB/2C
All High-Z
Serial interface
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