EVAL-AD7994CB Analog Devices Inc, EVAL-AD7994CB Datasheet - Page 4

• Manufacturer Part Number: EVAL-AD7994CB
• Description: BOARD EVALUATION FOR AD7994
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7994CB

• Number Of Adc's: 1
• Number Of Bits: 12
• Sampling Rate (per Second): 188k
• Data Interface: Serial
• Inputs Per Adc: 4 Single Ended
• Input Range: 0 ~ 5.5 V
• Power (typ) @ Conditions: 7.7mW @ 188kSPS, 5.5 V
• Voltage Supply Source: Single
• Operating Temperature: -40°C ~ 125°C
• Utilized Ic / Part: AD7994
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

EVAL-AD7993/AD7994CB
INITIAL SETUP CONDITIONS
ANALOG INPUT RANGES
Because the device is unipolar, the analog input range to the
AD7993/AD7994 is 0 to REF
need to be level shifted before being applied to the AD7993/
AD7994. Each EVAL-AD7993/AD7994CB includes a bias-up
circuit, which uses the reference voltage to bias up the bipolar
analog input signal.
Table 2.
Link No.
LK1
LK2 to LK4
LK5
LK6
LK7
LK8
LK9
LK10
LK11
LK12
LK13
LK14
LK15
LK16
LK17
LK18
K1 to K4
Position
A
B
A
A
A
A
B
A
OUT
B
A
OUT
B
B
B
B
OUT
Function
Noninverting input of AD713 is connected to V
Noninverting AD713 inputs are connected to AGND.
The SCL pin on the AD7993/AD7994 is connected to the SMB SCL socket.
The SDA pin on the AD7993/AD7994 is connected to the SMB SDA socket.
The BUSY/ALERT pin on the AD7993/AD7994 is connected to the SMB ALERT socket.
The SDA signal to be applied to the input of the 74HC05 inverter is applied through the SMB SDA input/output
socket.
V
The AD780 supplies the reference voltage to the REF
The AD780 voltage reference is set to 2.5 V.
The CONVST signal is taken from the CONVST SMB socket. This is an externally generated signal.
The AS pin on the AD7993/AD7994 is tied to V
No 51 Ω resistance on the inputs.
The +12 V supply is applied through the J3 connector. This supply is used as the positive supply for the AD713 device.
The −12 V supply is applied through the J3 connector. This supply is used as the negative supply for the AD713 device.
The SCL signal to be applied to the 74HC05 inverter is applied to the SCL SMB socket.
An inverted SDA output signal is available at the SDA input/output SMB socket.
No 51 Ω termination on the V
DD
supply is taken from the J2 connector.
IN
. Therefore, all bipolar signals
IN
1 to V
IN
Rev. 0 | Page 4 of 12
4 analog inputs SMB sockets.
DD
IN
. See the AD7993/AD7994 data sheet for I
1 SMB socket.
DEFAULT LINK POSITIONS
Before applying power and signals to the evaluation board,
ensure that all link options are configured per the required
operating mode. Table 2 outlines the positions of all links when
packaged. EVAL-AD7993/AD7994CB are set for standalone
capability only.
IN
pin on the AD7993/AD7994.
2
C address options.