Rainbow Electronics MX7847 - Manual (Page 5)

MX7837/MX7847
Complete, Dual, 12-Bit
Multiplying DACs
_______________________________________________________________________________________ 5
A AGNDA
A = V
OUTA
, 50mV/div
TIMEBASE = 2 µ s/div
V REFA = ±100mV SQUARE WAVE
SMALL-SIGNAL PULSE RESPONSE
A AGNDA
A = V OUTA , 5V/div
TIMEBASE = 2 µ s/div
V REFA = ±10V SQUARE WAVE
LARGE-SIGNAL PULSE RESPONSE
______________________________________________________________Pin Description
PIN
MX7837 MX7847
NAME FUNCTION
1 – CS Chip Select – active-low logic input
– 1 CSA Chip-Select Input for DAC A – active-low logic input
2 R
FBA
Amplifier Feedback Resistor for DAC A
– 2 CSB Chip-Select Input for DAC B – active-low logic input
3 3 V REFA Reference Input Voltage for DAC A
4 4 V OUTA Analog Output Voltage from DAC A
5 5 AGNDA Analog Ground for DAC A
6 6 V
DD
Positive Power Supply
–
7 7 V SS Negative Power Supply
8 8 AGNDB Analog Ground for DAC B
9 9 V OUTB Analog Output Voltage from DAC B
10 10 V REFB Reference Input Voltage for DAC B
11 11 DGND Digital Ground
12 – R FBB Amplifier Feedback Resistor for DAC B
– 12 DB11 Data Bit 11 (MSB)
13 13 WR
Write Input – active-low logic input (MX7837); positive-edge-triggered input used with
CSA and CSB (MX7847)
14 – LDAC Asynchronous Load – DAC input, active-low
– 14-24 DB10-DB0 Data Bit 10 to Data Bit 0 (LSB)
15 – A1 Address Input – most significant address input for input latches
16 – A0 Address Input – least significant address input for input latches
17-20 – DB7-DB4 Data Bit 7 to Data Bit 4
21-24 –
DB3/DB11-
DB0/DB8
Data Bit 3 to Data Bit 0 (LSB), or Data Bit 11 (MSB) to Data Bit 8
____________________________Typical Operating Characteristics (continued)
(T
A
= +25°C, V
DD
= 15V, V
SS
= -15V, R
L
= 2k Ω , C
L
= 100pF, unless otherwise noted.)