EVAL-AD7723CBZ Analog Devices Inc, EVAL-AD7723CBZ Datasheet - Page 11

• Manufacturer Part Number: EVAL-AD7723CBZ
• Description: BOARD EVALUATION FOR AD7723
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7723CBZ

• Number Of Adc's: 1
• Number Of Bits: 16
• Sampling Rate (per Second): 1.2M
• Data Interface: Serial, Parallel
• Inputs Per Adc: 1 Differential
• Input Range: ±VREF
• Power (typ) @ Conditions: 475mW @ 1.2MSPS
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD7723
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 6. Pin Function Descriptions
Pin No.
6, 28
8, 7
9, 10
11
12
13
14
15
16, 18, 25
17, 26
19
20
21
22
23
24
27
Mnemonic
DGND
MODE1/MODE2
AGND1
AV
CLKIN
XTAL
XTAL_OFF
HALF_PWR
AGND
AV
VIN(−)
VIN(+)
REF1
AGND2
REF2
UNI
STBY
DD1
DD
Ground Reference for Digital Circuitry.
Digital Logic Power Supply Ground for the Analog Modulator.
Input to Crystal Oscillator Amplifier. If an external clock is used, XTAL should be tied to AGND1.
Power Supply Ground for the Analog Modulator.
Negative Terminal of the Differential Analog Input.
Positive Terminal of the Differential Analog Input.
Description
Mode Control Inputs. The MODE1 and MODE2 pins choose either parallel or serial data interface operation
and select the operating mode for the digital filter in parallel mode. See Table 3 and Table 4.
Digital Logic Power Supply Voltage for the Analog Modulator.
Clock Input. An external clock source can be applied directly to this pin with XTAL_OFF tied high.
Alternatively, a parallel resonant fundamental frequency crystal, in parallel with a 1 MΩ resistor, can
be connected betweenthe XTAL pin and the CLKIN pin with XTAL_OFF tied low. External capacitors
are then required from the CLKIN and XTAL pins to ground. Consult the crystal manufacturer’s
recommendation for the load capacitors.
Oscillator Enable Input. A logic high disables the crystal oscillator amplifier to allow use of an external
clock source. Set low when using an external crystal between the CLKIN and XTAL pins.
When set high, the power dissipation is reduced by approximately one-half, and a maximum CLKIN
frequency of 10 MHz applies.
Positive Power Supply Voltage for the Analog Modulator.
Reference Output. REF1 connects through 3 kΩ to the output of the internal 2.5 V reference and to a buffer
amplifier that drives the Σ-∆ modulator.
Power Supply Ground Return to the Reference Circuitry, REF2, of the Analog Modulator.
Reference Input. REF2 connects to the output of an internal buffer amplifier that drives the Σ-∆ modulator.
When REF2 is used as an input, REF1 must be connected to AGND to disable the internal buffer amplifier.
Analog Input Range Select Input. The UNI pin selects the analog input range for either bipolar or unipolar
operation. A logic high input selects unipolar operation and a logic low selects bipolar operation.
Standby Logic Input. A logic high sets the AD7723 into the power-down state.
DGND/DRDY
DGND/DB2
DGND/DB1
DGND/DB0
CFMT/RD
MODE1
MODE2
AGND1
AGND1
AV
DGND
DD1
10
11
1
2
3
4
5
6
7
8
9
44
12 13 14 15 16 17 18 19 20 21 22
PIN 1
IDENTIFIER
43
42
Figure 11. 44-Lead MQFP
Rev. C | Page 11 of 32
41
(Not to Scale)
AD7723
TOP VIEW
40 39 38
37
36 35 34
33 SCR/DB13
32
30
29
28
27
26
25
24
23
31
DGND/DB14
DGND/DB15
DV
SYNC
DGND
STBY
AV
AGND
UNI
REF2
DD
DD
/CS
AD7723