Datasheet

AD7834/AD7835
Rev. D | Page 10 of 28
Pin No.
MQFP
Pin No. PLCC Pin Mnemonic Description
16 to 29 22 to 35 DB0 to DB13
Parallel Data Inputs. The AD7835 can accept a straight 14-bit parallel word on DB0 to
DB13, where DB13 is the MSB and the
BYSHF input is hardwired to a logic high.
Alternatively for byte loading, the bottom eight data inputs, DB0 to DB7, are used for
data loading, and the top six data inputs, DB8 to DB13, should be hardwired to a logic
low. The
BYSHF control input selects whether 8 LSBs or 6 MSBs of data are being loaded
into the device.
32 38 DSGB
Device Sense Ground B Input. Used in conjunction with the
CLR input for power-on
protection of the DACs. When
CLR is low, DAC outputs V
OUT
3 and V
OUT
4 are forced to the
potential on the DSGB pin.
36, 35 42, 41 V
REF
(+)B, V
REF
(−)B Reference Inputs for DACs 3 and 4. These reference voltages are referred to AGND.
38 44 AGND Analog Ground.
39 1 V
DD
Positive Analog Power Supply: 15 V ± 5% or 12 V ± 5%.
40 2 V
SS
Negative Analog Power Supply: −15 V ± 5% or −12 V ± 5%.
42, 43 4, 5 V
REF
(+)A, V
REF
(−)A Reference Inputs for DAC 1 and DAC 2. These reference voltages are referred to AGND.