Datasheet
Data Sheet AD1938
Rev. E | Page 9 of 32
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
05582-002
AVDD
48
LF
47
ADC2RN
46
ADC2RP
45
ADC2LN
44
ADC2LP
43
ADC1RN
42
ADC1RP
41
ADC1LN
40
ADC1LP
39
CM
38
AVDD
37
DVDD
13
DSDATA3
14
DSDATA2
15
DSDATA1
16
DBCLK
17
DLRCLK
18
ASDATA2
19
ASDATA1
20
ABCLK
21
ALRCLK
22
CIN
23
COUT
24
AGND
1
MCLKI/XI
2
MCLKO/XO
3
AGND
4
AVDD
5
OL3
6
OR3
7
OL4
8
OR4
9
PD/RST
10
DSDATA4
11
DGND
12
AGND
36
FILTR
35
AGND
34
AVDD
33
AGND
32
OR2
31
OL2
30
OR1
29
OL1
28
CLATCH
27
CCLK
26
DGND
25
AD1938
TOP VIEW
(Not to Scale)
SINGLE-ENDED
OUTPUT
Figure 2. Pin Configuration, 48-Lead LQFP
Table 10. Pin Function Descriptions
Pin No. In/Out Mnemonic Description
1 I AGND Analog Ground.
2 I MCLKI/XI Master Clock Input/Crystal Oscillator Input.
3 O MCLKO/XO Master Clock Output/Crystal Oscillator Output.
4
I
AGND
Analog Ground.
5 I AVDD Analog Power Supply. Connect to analog 3.3 V supply.
6 O OL3 DAC 3 Left Output.
7 O OR3 DAC 3 Right Output.
8 O OL4 DAC 4 Left Output.
9
O
OR4
DAC 4 Right Output.
10 I
PD
/
RST
Power-Down Reset (Active Low).
11 I/O DSDATA4 DAC Serial Input 4. Data input to DAC4 data in/TDM DAC2 data out (dual-line mode)/AUX DAC2 data
out (to external DAC2).
12 I DGND Digital Ground.
13 I DVDD Digital Power Supply. Connect to digital 3.3 V supply.
14
I/O
DSDATA3
DAC Serial Input 3. Data input to DAC3 data in/TDM DAC2 data in (dual-line mode)/AUX ADC2 data
in (from external ADC2).
15 I/O DSDATA2 DAC Serial Input 2. Data input to DAC2 data in/TDM DAC data out/AUX ADC1 data in (from external
ADC1).
16 I DSDATA1 DAC Serial Data Input 1. Data input to DAC1 data in/TDM DAC data in/TDM data in.
17 I/O DBCLK Bit Clock for DACs.
18 I/O DLRCLK LR Clock for DACs.
19 I/O ASDATA2 ADC Serial Data Output 2. Data output from ADC2/TDM ADC data in/AUX DAC1 data out (to external
DAC1).
20 O ASDATA1 ADC Serial Data Output 1. Data output from ADC1/TDM ADC data out/TDM data out.
21 I/O ABCLK Bit Clock for ADCs.
22
I/O
ALRCLK
LR Clock for ADCs.
23 I CIN Control Data Input (SPI).
24 I/O COUT Control Data Output (SPI).
25 I DGND Digital Ground.