LC2MOS Octal 8-Bit DAC
AD7228 Data Sheet
FEATURES FUNCTIONAL BLOCK DIAGRAM MSB 13
DATA
(8-BIT)
LSB 20 DATA BUS Eight 8-bit DACs with output amplifiers
Operates with single or dual supplies
Microprocessor-compatible (95 ns WR pulse)
No user trims required
Skinny 24-lead PDIP, CERDIP, and SOIC packages, and a
28-lead PLCC surface-mount package VREF VDD 11 1 LATCH 1 DAC 1 LATCH 2 DAC 2 LATCH 3 DAC 3 LATCH 4 DAC 4 LATCH 5 DAC 5 LATCH 6 DAC 6 LATCH 7 DAC 7 LATCH 8 DAC 8 1 9 VOUT1 2 8 VOUT2 3 7 VOUT3 4 6 VOUT4 5 5 VOUT5 6 4 VOUT6 7 3 VOUT7 8 2 VOUT8 WR 21 AD7228 CONTROL
LOGIC A0 24
10 12 VSS GND 13034-001 A2 22
A1 23 Figure 1. GENERAL DESCRIPTION
The AD7228 contains eight 8-bit voltage mode digital-to-analog
converters (DACs), with output buffer amplifiers and interface
logic on a single monolithic chip. No external trims are required
to achieve the full specified performance for the device.
Separate on-chip latches are provided for each of the eight DACs.
Data is transferred into the data latches through a common
8-bit, TTL/CMOS-compatible input port (5 V). The A0, A1,
and A2 address inputs determine which latch is loaded
when WR goes low. The control logic is speed compatible with …