AD9959
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
SYNC_IN
SYNC_OUT
MASTER_RESET
PWR_DWN_CTL
AVDD
1
2
3
4
5
6
7
8
9
PIN 1
INDICATOR
42 P2
41 P1
40 P0
39 AVDD
38 AGND
37 AVDD
36 CH1_IOUT
35 CH1_IOUT
34 AGND
33 AVDD
32 AGND
31 AVDD
30 CH0_IOUT
29 CH0_IOUT
AGND
AD9959
AVDD
CH2_IOUT
CH2_IOUT
TOP VIEW
(Not to Scale)
AGND 10
AVDD 11
AGND 12
CH3_IOUT 13
14
CH3_IOUT
NC = NO CONNECT
NOTES
1. THE EXPOSED EPAD ON BOTTOM SIDE OF PACKAGE IS
AN ELECTRICAL CONNECTION AND MUST BE
SOLDERED TO GROUND.
2. PIN 49 IS DVDD_I/O AND IS TIED TO 3.3V.
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
Mnemonic
I/O1
Description
1
SYNC_IN
I
Used to Synchronize Multiple AD9959 Devices. Connects to the SYNC_OUT pin of
the master AD9959 device.
2
3
SYNC_OUT
O
I
Used to Synchronize Multiple AD9959 Devices. Connects to the SYNC_IN pin of the
slave AD9959 devices.
Active High Reset Pin. Asserting the MASTER_RESET pin forces the AD9959 internal
registers to their default state, as described in the Register Maps and Bit Descriptions
section.
MASTER_RESET
4
PWR_DWN_CTL
AVDD
I
I
External Power-Down Control.
Analog Power Supply Pins (1.8 V).
5, 7, 11, 15, 19, 21,
26, 31, 33, 37, 39
6, 10, 12, 16, 18, 20,
25, 28, 32, 34, 38
AGND
I
Analog Ground Pins.
45, 55
44, 56
8
DVDD
DGND
I
I
Digital Power Supply Pins (1.8 V).
Digital Power Ground Pins.
True DAC Output. Terminates into AVDD.
Complementary DAC Output. Terminates into AVDD.
True DAC Output. Terminates into AVDD.
Complementary DAC Output. Terminates into AVDD.
CH2_IOUT
CH2_IOUT
CH3_IOUT
CH3_IOUT
DAC_RSET
O
O
O
O
I
9
13
14
17
Establishes the Reference Current for All DACs. A 1.91 kΩ resistor (nominal) is
connected from Pin 17 to AGND.
22
23
REF_CLK
REF_CLK
I
I
Complementary Reference Clock/Oscillator Input. When the REF_CLK is operated
in single-ended mode, this pin should be decoupled to AVDD or AGND with a
0.1 μF capacitor.
Reference Clock/Oscillator Input. When the REF_CLK is operated in single-ended
mode, this is the input. See the Modes of Operation section for the reference clock
configuration.
Rev. B | Page 9 of 44
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