HS3120 Datasheet, PDF (1/3 Pages) Sipex Corporation – Double Buffered 12-Bit MDAC

D ouble Buffered 12-Bit MD AC
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 DA C 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.
DOUBLE BUFFERED —The input registers are sectioned
into 3 segments of 4 bits each, all individually
addressable. The DA C register, following the input
registers, is a parallel 12-bit register for holding the
DA C data while the input registers are updated. Only
the data held in the DA C register determines the
analog output value of the converter.
M ICRO PROCESSOR COM PA TIBLE — 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
HS 3120
D ata Converter Line
controls are level-triggered to allow static or dynamic
operation.
V ERSA TILE 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 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
CE ²²
HBE ²⁵
MBE ²⁴
LBE ²³
LDAC ²¹
CONTROL
LOGIC
(M SB)
BIT 1 2 3 4
9 10 11 12
56 78
13 14 15 16
INPUT REGISTER INPUT REGISTER
DAC REGISTER
(LSB)
9 10 11 BIT 12 V _REF
17 18 19 20
4
INPUT REGISTER
12 BIT M DAC
R
R/2
R/2
HS 3120
28
26
27
8
2
VDD1 VDD2 GND GND
LDTR
165Cedar Hill Street,Marlborough,MA01752 Tel:[phone] Fax: [phone]
www.SpectrumMicrowave.com
5
FB1
6 _I01
7 _I02
1 _FB4
3 _FB3