LTC2641 Linear Technology, LTC2641 Datasheet - Page 10

• Manufacturer Part Number: LTC2641
• Description: (LTC2641 / LTC2642) 16-/14-/12-Bit VOUT DACs
• Manufacturer: Linear Technology

LTC2641/LTC2642
General Description
The LTC2641/LTC2642 family of 16-/14-/12-bit voltage
output DACs offer full 16-bit performance with less than
±2LSB integral linearity error and less than ±1LSB differen-
tial linearity error, guaranteeing monotonic operation. They
operate from a single supply ranging from 2.7V to 5.5V,
consuming 120μA (typical). An external voltage reference
of 2V to V
age. A 3-wire serial interface allows the LTC2641/LTC2642
to fi t into a small 8-/10-pin MSOP or DFN 3mm × 3mm
package.
BLOCK DIAGRAMS
TIMING DIAGRAM
OPERATION
10
CS/LD
SCK
SDI
www.DataSheet4U.com
2
3
4
5
LTC2641-16
LTC2641-14
LTC2641-12
CS
SCLK
DIN
CLR
DD
determines the DAC’s full-scale output volt-
POWER-ON
CONTROL
RESET
LOGIC
t
V
5
DD
7
16-BIT SHIFT REGISTER
LTC2641
16-BIT DATA LATCH
16-/14-/12-BIT DAC
t
7
1
REF
t
1
t
2
1
GND
V
8
OUT
6
2641 BD
t
2
3
Digital-to-Analog Architecture
The DAC architecture is a voltage switching mode resis-
tor ladder using precision thin-fi lm resistors and CMOS
switches. The LTC2641/LTC2642 DAC resistor ladders are
composed of a proprietary arrangement of matched DAC
sections. The four MSBs are decoded to drive 15 equally
weighted segments, and the remaining lower bits drive
successively lower weighted sections. Major carry glitch
impulse is very low at 500pV•sec, C
lower than previous DACs of this type.
t
4
2
3
4
5
LTC2642-16
LTC2642-14
LTC2642-12
CS
SCLK
DIN
CLR
3
POWER-ON
CONTROL
RESET
LOGIC
V
DD
9
15
16-BIT SHIFT REGISTER
LTC2642
16-BIT DATA LATCH
16-/14-/12-BIT DAC
1
REF
t
6
16
L
= 10pF, ten times
t
8
GND
V
10
INV
OUT
R
FB
8
7
6
2642 BD
26412f
26412 TD