EVAL-AD7994CB Analog Devices Inc, EVAL-AD7994CB Datasheet - Page 3

• 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

OPERATING THE EVAL-AD7993/AD7994CB
The EVAL-AD7993/AD7994CB has several link options that can be used to control and configure the AD7993/AD7994. These options must
be set for the required operating configuration before using the evaluation board. Table 1 outlines the functions of the link options.
Table 1.
Link No.
LK1 to LK4
LK5
LK6
LK7
LK8
K1 to K4
LK9
LK10
LK11
LK12
LK13
LK14
LK15
LK16
LK17
LK18
Function
Allow the user to connect the inputs of the AD713 to the input sockets (V
In Position A, the relevant AD713 input is connected to the relevant input socket.
In Position B, the relevant AD713 input is connected to AGND.
Selects the source of the SCL clock to be fed into the SCL pin of the AD7993/AD7994.
In Position A, the SCL signal comes from the SMB SCL socket.
In Position B, the SCL signal comes from the 74HC05, whose input signal in turn is chosen by LK17.
Selects the source/destination of the SDA signal to/from the SDA pin of the AD7993/AD7994.
When in Position A, the SDA signal comes from/goes to the SMB SDA socket.
When in Position B, the SDA signal comes from/goes to the 74HC05 chip, whose input/output signal in turn is chosen by LK18
and LK19.
This link option is used to select the destination of the BUSY/ALERT signal.
When in Position A, the BUSY/ALERT signal is fed to the SMB ALERT socket.
When in Position B, the BUSY/ALERT signal is fed to the 74HC05, where the inverted output is fed to the 96-way connector.
Selects the source of the SDA signal to be fed into the 74HC05.
When in Position A, the SDA signal comes from the 96-way connector.
When in Position B, the SDA signal comes from the external SMB socket, SDA input.
Add a 51 Ω termination resistor to AGND at the V
When a 51 Ω termination is required, these links should be inserted.
Selects the source of the V
In Position A, the supply voltage, V
In Position B, the supply voltage, V
Selects the source of the REF
In Position A, the AD780 supplies the 2.5 V reference to the AD7993/AD7994.
In Position B, the REF192 supplies the 2.5 V reference to the AD7993/AD7994.
In Position C, the reference is taken from the externally applied reference via the REF
Controls the program pin of the AD780 voltage reference.
When inserted, the AD780 output voltage is set to 3.0 V; when removed, the AD780 voltage is set to 2.5 V.
This link option selects the source of the CONVST input signal for the AD7993/AD7994.
In Position A, the CONVST signal is taken from the evaluation controller board via the 96-way connector.
In Position B, the CONVST signal is taken from the externally applied CONVST signal via the SMB socket.
Selects the voltage being applied to the AS pin that is used to set the final three bits of the AD7993/AD7994 I
In Position A, the AS pin is tied to VDD.
In Position B, the AS pin is tied to AGND.
Refer to the AD7993/AD7994 data sheet for the I
Adds a 51 Ω termination resistor to AGND at the input socket for V
should be inserted.
Selects the source of the +12 V supply for the EVAL-AD7993/AD7994CB.
In Position A, the +12 V supply is sourced from the evaluation board controller via the 96-way connector.
In Position B, the +12 V supply is sourced externally via the J3 connector.
Selects the source of the −12 V supply for the EVAL-AD7993/AD7994CB.
In Position A, the −12 V supply is sourced from the evaluation board controller via the 96-way connector.
In Position B, the −12 V supply is sourced externally via the J3 connector.
Selects the source of the SCL clock to be fed into the 74HC05.
In Position A, the SCL signal comes from the 96-way connector.
In Position B, the SCL signal comes from the external SMB socket, SCL.
Selects the destination for the inverted SDA output from the AD7993/AD7994.
In Position A, the inverted SDA signal is fed to the 96-way connector.
In Position B, the inverted SDA signal is fed to the SDA output SMB socket.
DD
supply to the AD7993/AD7994.
IN
voltage to be applied to the REF
DD
DD
, is taken from an external source via J2.
, is taken from the evaluation board controller via the 96-way connector.
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2
IN
C address for each configuration.
1 to V
IN
4 input sockets.
IN
pin of the AD7993/AD7994.
IN
1 to V
IN
IN
4. When a 51 Ω termination is required, this link
1 to V
IN
4) or tie the AD713 inputs to AGND.
IN
SMB socket.
EVAL-AD7993/AD7994CB
2
C bus address.