HS 3120
Data Converter Line
Double Buffered 12-Bit MDAC
FEATURES
• M onolithic Construction
• 12-Bit Resolution
• 0.01% Non-Linearity
• jup Compatible
• 4-Quadrant M ultiplication
• Latch-up Protected
DESCRIPTION
The HS 3120 is a precision monolithic 12-bit
multiplying DAC with internal two-stage input
storage registers for easy interfacing with
microprocessor busses. It is packaged in a 28-pin DIP
to give high I/O design flexibility.
controls are level-triggered to allow static or dynamic
operation.
DOUBLE BUFFERED —The input registers are sectioned
into 3 segments of 4 bits each, all individually
addressable. The DAC register, following the input
registers, is a parallel 12-bit register for holding the
DAC data while the input registers are updated. Only
the data held in the DAC register determines the
analog output value of the converter.
VERSATILE OUTPUTS —A total of 5 output lines are
provided by the HS 3120 to allow unipolar and
bipolar output connection with a minimum of
external components. The feedback resistor is
internal. The resistor ladder network termination is
externally available, thus eliminating an external
resistor for the 1 LSB offset in bipolar mode.
M ICRO PROCESSOR COM PATIBLE — The HS 3120 has
been designed for great flexibility in connecting to
bus-oriented systems. The 12 data inputs are
organized into 3 independent addressable 4-bit input
registers such that the HS 3120 can be connected to
either a 4, 8 or 16-bit data bus. The control logic of
the HS 3120 includes chip enable and latch enable
inputs for flexible memory mapping. All
M ONOLITHIC CM OS CONSTRUCTION —The HS 3120
is a one-chip CM OS circuit with a resistor ladder
network designed for 0.01% linearity without laser
trimming. Small chip size and high manufacturing
yields result in greatly reduced cost.
FUNCTIONAL DIAGRAM
(M SB)
(LSB)
10 11 BIT 12
2
3
4
5
6
7
8
9
V
4
1
BIT
REF
9
10 11 12
13 14 15 16
17 18 19 20
INPUT REGISTER
22
25
24
23
21
CE
HBE
INPUT REGISTER
INPUT REGISTER
CONTROL
LOGIC
M BE
LBE
R
5
6
7
1
3
FB
I
1
01
LDAC
DAC REGISTER
12 BIT M DAC
I
02
FB
FB
4
3
R/
R/
2
2
HS 3120
28
26
27
GND
8
2
LDTR
V
V
GND
DD1
DD2
165CedarHill Street,Marlborough,MA01752 Tel:508.485.6350 Fax: 508.485.5168
www.SpectrumMicrowave.com