Datasheet

AD7810
–4–
REV. B
PIN FUNCTION DESCRIPTIONS
Pin No. Mnemonic Description
1 CONVST Convert Start. Falling edge puts the track-and-hold into hold mode and initiates a conversion.
A rising edge on the CONVST pin enables the serial port of the AD7810. This is useful in multi-
package applications where a number of devices share the same serial bus. The state of this pin at
the end of conversion also determines whether the part is powered down or not. See Operating
Modes section of this data sheet.
2V
IN+
Positive input of the pseudo differential analog input.
3V
IN–
Negative input of the pseudo differential analog input.
4 GND Ground reference for analog and digital circuitry.
5V
REF
External reference is connected here.
6D
OUT
Serial data is shifted out on this pin.
7 SCLK Serial Clock. An external serial clock is applied here.
8V
DD
Positive Supply Voltage 2.7 V to 5.5 V.
PIN CONFIGURATION
DIP/SOIC
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
AD7810
CONVST
V
IN
+
V
IN
–
GND
V
DD
SCLK
D
OUT
V
REF
THROUGHPUT – kSPS
10
1
0.01
030
POWER – mW
10
0.1
20
40 50
Figure 2. Power vs. Throughput
Typical Performance Characteristics
FREQUENCY BINS
–115
dBs
–95
1
23 45 67 89
111 133 155 177 199 221 243 265 287 309 331 353 375 397 419 441 463 485 507 529 551 573 595 617 639 661 683 705 727 749 771 793 815 837 859 881 903 925 947 969 991
1013
–75
–55
–35
–15
2048 POINT FFT
SAMPLING 357.142kSPS
F
IN
= 30kHz
Figure 3. AD7810 SNR