LTC1657CGN Linear Technology, LTC1657CGN Datasheet - Page 12

• Manufacturer Part Number: LTC1657CGN
• Description: IC DAC 16BIT R-R MICROPWR 28SSOP
• Manufacturer: Linear Technology

Specifications of LTC1657CGN

• Settling Time: 20µs
• Number Of Bits: 16
• Data Interface: Parallel
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 3mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC1657/LTC1657L
This circuit shows how to make a bipolar output 16-bit
DAC with a wide output swing using an LTC1657 and an
LT1077. R1 and R2 resistively divide down the LTC1657
output and an offset is summed in using the LTC1657
onboard 2.048V reference and R3 and R4. R5 ensures that
TYPICAL APPLICATIO S
12
P
5:19
28
27
2
3
1
DATA (0:15)
CSLSB
CSMSB
WR
LDAC
CLR
X1/X2
26
REFLO
U
21
LTC1657
GND
A Wide Swing, Bipolar Output 16-Bit DAC
– 4.096
20
4.096
V
OUT
REFHI REFOUT
22
R5
100k
1%
0
V
5V
CC
23
24
TRANSFER CURVE
32768
V
OUT
100k
1%
R3
0.1 F
25
the onboard reference is always sourcing current and
never has to sink any current even when V
scale. The LT1077 output will have a wide bipolar output
swing of – 4.096V to 4.096V as shown in the figure below.
With this output swing, 1LSB = 125 V.
R1
100k
1%
R2
200k
1%
65535
3
2
D
–
IN
+
LT1077
– 5V
5V
7
4
200k
1%
R4
6
1657 TA05
V
OUT
:
(2)(D
65536
IN
)(4.096)
– 4.096V
OUT
is at full