AD7631BCPZ Analog Devices Inc, AD7631BCPZ Datasheet - Page 11

• Manufacturer Part Number: AD7631BCPZ
• Description: IC,A/D CONVERTER,SINGLE,18-BIT,CMOS,LLCC,48PIN
• Manufacturer: Analog Devices Inc
• Series: PulSAR®r

Specifications of AD7631BCPZ

• Number Of Bits: 18
• Sampling Rate (per Second): 250k
• Data Interface: Serial, Parallel
• Number Of Converters: 1
• Power Dissipation (max): 120mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-VFQFN, CSP Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Pin No.
37
38
39
40
41
43
45
46
47
48
49
1
2
3
Table 7. Data Bus Interface Definition
MODE
0
1
1
2
2
2
2
3
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.
LFCSP_VQ package only.
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 Configuraion section.
MODE1
0
0
0
1
1
1
1
1
Mnemonic
REF
REFGND
IN−
VCC
VEE
IN+
TEMP
REFBUFIN
PDREF
PDBUF
EPAD
3
MODE0
0
1
1
0
0
0
0
1
AI
P
P
Type
AO/I
AI
AI
AO
AI
DI
DI
NC
1
D0/OB/ 2C
R[0]
OB/2C
OB/2C
OB/2C
OB/2C
OB/2C
OB/2C
OB/2C
Reference Input Analog Ground. Connected to analog ground plane.
High Voltage Positive Supply. Normally +7 V to +15 V.
High Voltage Negative Supply. Normally 0 V to −15 V (0 V in unipolar ranges).
Description
Reference Input/Output. When PDREF/PDBUF = low, the internal reference and buffer are enabled
producing 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.
Analog Input. Referenced to IN+.
In the 0 V to 5 V input range, IN− is between 0 V and V
range, IN− is between 0 V and 2 V
In the ±5 V and ±10 V ranges, IN− is true bipolar up to ±2 V
and centered about 0 V.
In all ranges, IN− must be driven 180° out of phase with IN+.
Analog Input. Referenced to IN−.
In the 0 V to 5 V input range, IN+ is between 0 V and V
range, IN+ is between 0 V and 2 V
In the ±5 V and ±10 V ranges, IN+ is true bipolar up to ±2 V
and centered about 0 V.
In all ranges, IN+ must be driven 180° out of phase with IN−.
Temperature Sensor Analog Output. When the internal reference is enabled (PDREF = PDBUF = low),
this pin outputs a voltage proportional to the temperature of the AD7631. See the Voltage Reference
Input/Output section.
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.
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.
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.
Exposed Pad. The exposed pad is not connected internally. It is recommended that the pad be soldered
to VEE.
D1/A0
R[1]
A0 = 0
A0 = 1
A0 = 0
A0 = 0
A0 = 1
A0 = 1
All High-Z
D2/A1
R[2]
R[0]
A1 = 0
A1 = 1
R[2]
A1 = 0
A1 = 1
Rev. A | Page 11 of 32
R[3]
R[1]
D[3]
R[3]
REF
REF
All High-Z
All High-Z
All High-Z
All High-Z
V centered about V
V centered about V
D[4:9]
R[4:9]
R[4:9]
D[10:11]
R[10:11]
R[10:11]
R[10:11]
R[2:3]
R[0:1]
REF
REF
Serial interface
REF
REF
All zeros
V centered about V
V centered about V
All zeros
.
.
REF
REF
V (±5 V range) or ±4 V
V (±5 V range) or ±4 V
D[12:15]
R[12:15]
R[12:15]
R[12:15]
R[4:7]
All zeros
D[16:17]
R[16:17]
R[16:17]
R[16:17]
R[8:9]
R[0:1]
REF
REF
/2. In the 0 V to 10 V
/2. In the 0 V to 10 V
REF
REF
V (±10 V range)
V (±10 V range)
Description
18-bit parallel
16-bit high word
16-bit low word
8-bit high byte
8-bit midbyte
8-bit low byte
8-bit low byte
Serial interface
AD7631