AD7653AST Analog Devices Inc, AD7653AST Datasheet - Page 8

• Manufacturer Part Number: AD7653AST
• Description: IC ADC 16BIT 1MSPS W/REF 48-LQFP
• Manufacturer: Analog Devices Inc
• Series: PulSAR®r

Specifications of AD7653AST

• Rohs Status: RoHS non-compliant
• Number Of Bits: 16
• Sampling Rate (per Second): 1M
• Data Interface: Serial, Parallel
• Number Of Converters: 1
• Power Dissipation (max): 145mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• For Use With: EVAL-AD7653CBZ - BOARD EVALUATION FOR AD7653

AD7653
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 6. Pin Function Descriptions
Pin No.
1, 36,
41, 42
2, 44
3, 40
4
5
6
7
8
9, 10
11, 12
13
14
Mnemonic
AGND
AVDD
NC
BYTESWAP
OB/2C
WARP
IMPULSE
SER/PAR
D[0:1]
D[2:3]or
DIVSCLK[0:1]
D4 or
EXT/ INT
D5 or
INVSYNC
DI
DI
Type
P
P
DI
DI
DI
DO
DI/O
DI/O
DI/O
1
Description
Analog Power Ground Pin.
Input Analog Power Pin. Nominally 5 V.
No Connect.
Parallel Mode Selection (8-/16-bit). When LOW, the LSB is output on D[7:0] and the MSB is output on
D[15:8]. When HIGH, the LSB is output on D[15:8] and the MSB is output on D[7:0].
Straight Binary/Binary Twos Complement. When OB/2C is HIGH, the digital output is straight binary;
when LOW, the MSB is inverted, resulting in a twos complement output from its internal shift
register.
Mode Selection. When this pin is HIGH and the IMPULSE pin is LOW, this input selects the fastest
mode, the maximum throughput is achievable, and a minimum conversion rate must be applied in
order to guarantee full specified accuracy. When LOW, full accuracy is maintained independent of
the minimum conversion rate.
Mode Selection. When IMPULSE is HIGH and WARP is LOW, this input selects a reduced power
mode. In this mode, the power dissipation is approximately proportional to the sampling rate.
Serial/Parallel Selection Input. When LOW, the parallel port is selected; when HIGH, the serial
interface mode is selected and some bits of the DATA bus are used as a serial port.
Bit 0 and Bit 1 of the Parallel Port Data Output Bus. When SER/PAR is HIGH, these outputs are in high
impedance.
When SER/PAR is LOW, these outputs are used as Bit 2 and Bit 3 of the parallel port data output bus.
When SER/PAR is HIGH, EXT/INT is LOW, and RDC/SDIN is LOW (serial master read after convert),
these inputs, part of the serial port, are used to slow down, if desired, the internal serial clock that
clocks the data output. In other serial modes, these pins are not used.
When SER/PAR is LOW, this output is used as Bit 4 of the parallel port data output bus.
When SER/PAR is HIGH, this input, part of the serial port, is used as a digital select input for choos-
ing the internal data clock or an external data clock. With EXT/INT tied LOW, the internal clock is
selected on the SCLK output. With EXT/INT set to logic HIGH, output data is synchronized to an
external clock signal connected to the SCLK input.
When SER/PAR is LOW, this output is used as Bit 5 of the parallel port data output bus.
When SER/PAR is HIGH, this input, part of the serial port, is used to select the active state of the
SYNC signal. It is active in both master and slave modes. When LOW, SYNC is active HIGH. When
HIGH, SYNC is active LOW.
NC = NO CONNECT
D2/DIVSCLK0
D3/DIVSCLK1
Figure 4. 48-Lead LQFP (ST-48) and 48-Lead LFCSP (CP-48)
BYTESWAP
IMPULSE
SER/PAR
OB/2C
WARP
AGND
AVDD
NC
D0
D1
10
11
12
1
2
3
4
5
6
7
8
9
48 47 46 45 44
13 14 15 16 17 18 19 20 21 22 23 24
PIN 1
IDENTIFIER
Rev. A | Page 8 of 28
(Not to Scale)
TOP VIEW
AD7653
43 42 41 40
39 38 37
36
35
34
33
32
31
30
29
28
27
26
25
02966-0-002
AGND
CNVST
PD
RESET
CS
RD
DGND
BUSY
D15
D14
D13
D12