AD7607_16 Datasheet, PDF (12/33 Pages) Analog Devices – 8-Channel DAS with 14-Bit, Bipolar Input, Simultaneous Sampling ADC

Data Sheet
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
AD7607
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
ANALOG INPUT
DECOUPLING CAP PIN
POWER SUPPLY
AVCC 1
AGND ²
OS 0 3
OS 1 4
GROUND PIN
OS 2 5
DATA OUTPUT
PAR/SER/BYTE SEL ⁶
DIGITAL OUTPUT
DIGITAL INPUT
REFERENCE INPUT/OUTPUT
STBY ⁷
RANGE 8
CONVST A ⁹
CONVST B 10
RESET 11
RD/SCLK 12
CS 13
BUSY 14
FRSTDATA 15
DB0 ₁₆
PIN 1
AD7607
TOP VIEW
(Not to Scale)
48 AVCC
47 AGND
46 REFGND
45 REFCAPB
44 REFCAPA
43 REFGND
42 REFIN/REFOUT
41 AGND
40 AGND
39 REGCAP
38 AVCC
37 AVCC
36 REGCAP
35 AGND
34 REF SELECT
33 DB15/BYTE SEL
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
Table 6. Pin Function Descriptions
Pin No.
Type¹
Mnemonic
1, 37, 38, 48 P
AVCC
2, 26, 35, 40, P
41, 47
AGND
5, 4, 3
DI
OS[2:0]
6
DI
PAR/SER/
BYTE SEL
7
DI
STBY
8
DI
RANGE
Figure 8. Pin Configuration
Description
Analog Supply Voltage, 4.75 V to 5.25 V. This supply voltage is applied to the internal front-end
amplifiers and to the ADC core. These supply pins should be decoupled to AGND.
Analog Ground. These pins are the ground reference points for all analog circuitry on the AD7607.
All analog input signals and external reference signals should be referred to these pins. All six of
these AGND pins should connect to the AGND plane of a system.
Oversampling Mode Pins. Logic inputs. These inputs are used to select the oversampling ratio. OS
2 is the MSB control bit, and OS 0 is the LSB control bit. See the Digital Filter section for more
details about the oversampling mode of operation and Table 9 for oversampling bit decoding.
Parallel/Serial/Byte Interface Selection Input. Logic input. If this pin is tied to a logic low, the parallel
interface is selected. If this pin is tied to a logic high, the serial interface is selected. Parallel byte
interface mode is selected when this pin is logic high and DB15/BYTE SEL is logic high (see Table 8).
In serial mode, the RD/SCLK pin functions as the serial clock input. The DB7/DOUTA pin and the
DB8/DOUTB pin function as serial data outputs. When the serial interface is selected, the DB[15:9] and
DB[6:0] pins should be tied to ground.
In byte mode, DB15, in conjunction with PAR/SER/BYTE SEL, is used to select the parallel byte mode
of operation (see Table 8). DB14 is used as the HBEN pin. DB[7:0] transfer the 16-bit conversion
results in two RD operations, with DB0 as the LSB of the data transfers.
Standby Mode Input. This pin is used to place the AD7607 into one of two power-down modes:
standby mode or shutdown mode. The power-down mode entered depends on the state of the
RANGE pin, as shown in Table 7. When in standby mode, all circuitry, except the on-chip reference,
regulators, and regulator buffers, is powered down. When in shutdown mode, all circuitry is powered
down.
Analog Input Range Selection. Logic input. The polarity on this pin determines the input range
of the analog input channels. If this pin is tied to a logic high, the analog input range is ±10 V for all
channels. If this pin is tied to a logic low, the analog input range is ±5 V for all channels. A logic
change on this pin has an immediate effect on the analog input range. Changing this pin during
a conversion is not recommended. See the Analog Input section for more information.
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