EVAL-AD7923CB Analog Devices Inc, EVAL-AD7923CB Datasheet - Page 7

• Manufacturer Part Number: EVAL-AD7923CB
• Description: BOARD EVAL FOR AD7923
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7923CB

• Rohs Status: RoHS non-compliant
• Number Of Adc's: 1
• Number Of Bits: 12
• Sampling Rate (per Second): 200k
• Data Interface: Serial
• Inputs Per Adc: 4 Single Ended
• Input Range: 0 ~ 2.5 V
• Power (typ) @ Conditions: *
• Voltage Supply Source: Single
• Operating Temperature: -40°C ~ 125°C
• Utilized Ic / Part: AD7923

PIN CONFIGURATION AND FUNCTION DESCRIPTION
Table 4. Pin Function Descriptions
Pin
No.
1
2
3
4, 8,
13, 16
5, 6
7
12 to 9
14
15
Mnemonic
SCLK
DIN
CS
AGND
AV
REF
V
DOUT
V
IN
DRIVE
0 to V
DD
IN
IN
3
Function
Serial Clock. Logic Input. SCLK provides the serial clock for accessing data for the part. This clock input is also used
as the clock source for the AD7923 conversion process.
Data In. Logic Input. Data to be written to the control register is provided on this input and is clocked into the
register on the falling edge of SCLK (see the Control Register Descriptions section).
Chip Select. Active low logic input. This input provides the dual function of initiating conversions on the AD7923
and framing the serial data transfer.
Analog Ground. Ground reference point for all analog circuitry on the AD7923. All analog input signals and any
external reference signal should be referred to this AGND voltage. All AGND pins should be connected together.
Analog Power Supply Input. The AV
AV
Reference Input for the AD7923. An external reference must be applied to this input. The voltage range for the
external reference is 2.5 V ± 1% for specified performance.
Analog Input 0 through Analog Input 3. Four single-ended analog input channels that are multiplexed into the on-
chip track-and-hold. The analog input channel to be converted is selected by using the Address Bits ADD1 and
ADD0 of the control register. The address bits in conjunction with the SEQ1 and SEQ0 bits allow the sequencer to
be programmed. The input range for all input channels can extend from 0 V to REF
selected via the range bit in the control register. Any unused input channels must be connected to AGND to avoid
noise pickup.
Data Out. Logic Output. The conversion result from the AD7923 is provided on this output pin as a serial data
stream. The AD7923 serial data stream consists of two leading 0s, and two address bits indicating which channel
the conversion result corresponds to, followed by 12 bits of conversion data, MSB first. The output coding can be
selected as straight binary or twos complement via the coding bit in the control register. The data bits are clocked
out of the AD7923 on the SCLK falling edge.
Logic Power Supply Input. The voltage supplied at this pin determines at which voltage the serial interface
operates.
DD
should be from 4.75 V to 5.25 V.
AGND
AGND
REF
SCLK
AV
AV
DIN
CS
DD
DD
IN
Figure 3. Pin Configuration
1
2
3
4
5
6
7
8
DD
Rev. B | Page 7 of 24
range for the AD7923 is from 2.7 V to 5.25 V. For the 0 V to 2 × REF
(Not to Scale)
TOP VIEW
AD7923
16
15
14
13
12
11
10
9
AGND
V
DOUT
AGND
V
V
V
V
DRIVE
IN
IN
IN
IN
0
1
2
3
IN
or from 0 V to 2 × REF
AD7923
IN
range,
IN
as