Datasheet
AD1974 Data Sheet
Rev. D | Page 8 of 24
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
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
AUXDATA2
14
AUXDATA1
15
NC
16
AUXBCLK
17
AUXLRCLK
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
NC
6
NC
7
NC
NC = NO CONNECT
8
NC
9
PD/RST
10
NC
11
DGND
12
AGND
36
FILTR
35
AGND
34
AVDD
33
AGND
32
NC
31
NC
30
NC
29
NC
28
CLATCH
27
CCLK
26
DGND
25
AD1974
TOP VIEW
(Not to Scale)
SINGLE-ENDED
OUTPUT
06614-020
Figure 2. AD1974 Single-Ended Output, 48-Lead LQFP Pin Configuration
Table 10. Pin Function Description
Pin No.
Type
1
Mnemonic
Description
1, 4, 32, 34, 36 I AGND Analog Ground.
2 I MCLKI/XI Master Clock Input/Crystal Oscillator Input.
3 O MCLKO/XO Master Clock Output/Crystal Oscillator Output.
5, 33, 37, 48 I AVDD Analog Power Supply. Connect to analog 3.3 V supply.
6 to 9, 11, 16, 28 to 31 NC No Connect.
10 I
PD
/
RST
Power-Down/Reset (Active Low).
12, 25
I
DGND
Digital Ground.
13
I
DVDD
Digital Power Supply. Connect to digital 3.3 V supply.
14 I/O AUXDATA2 Auxiliary Data Input 2 (From External ADC 2).
15 I/O AUXDATA1 Auxiliary Data Input 1 (From External ADC 1).
17 I/O AUXBCLK Auxiliary Bit Clock.
18 I/O AUXLRCLK Auxiliary Left-Right Framing Clock.
19 I/O ASDATA2 ADC Serial Data Output 2 (ADC 2 Left and ADC 2 Right)/ADC TDM Data Input.
20 O ASDATA1 ADC Serial Data Output 1 (ADC 1 Left and ADC 1 Right)/ADC TDM Data Output.
21 I/O ABCLK Serial Bit Clock for ADCs.
22 I/O ALRCLK Left-Right Framing Clock for ADCs.
23 I CIN Control Data Input (SPI).
24
I/O
COUT
Control Data Output (SPI).
26 I CCLK Control Clock Input (SPI).
27 I
CLATCH
Latch Input for Control Data (SPI).
35 O FILTR Voltage Reference Filter Capacitor Connection. Bypass with 10 µF||100 nF to AGND.
38 O CM Common-Mode Reference Filter Capacitor Connection. Bypass with 47 µF||100 nF to AGND.
39 I ADC1LP ADC1 Left Positive Input.
40 I ADC1LN ADC1 Left Negative Input.
41 I ADC1RP ADC1 Right Positive Input.
42 I ADC1RN ADC1 Right Negative Input.
43 I ADC2LP ADC2 Left Positive Input.