Datasheet
LTC2657
5
2657f
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
CC
= 2.7V to 5.5V, V
OUT
unloaded unless otherwise specifi ed.
LTC2657B-L16/LTC2657-L12 (Internal Reference = 1.25V)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OUT
DAC Output Span Internal Reference
External Reference = V
EXTREF
0 to 2.5
0 to 2 • V
EXTREF
V
V
PSR Power Supply Rejection V
CC
±10% –80 dB
R
OUT
DC Output Impedance V
CC
= 5V ±10%, Internal Reference, Mid-Scale,
–15mA ≤ I
OUT
≤ 15mA
l
0.04 0.15
V
CC
= 3V ±10%, Internal Reference, Mid-Scale,
–7.5mA ≤ I
OUT
≤ 7.5mA
l
0.04 0.15
DC Crosstalk (Note 5) Due to Full-Scale Output Change
Due to Load Current Change
Due to Powering Down (per Channel)
±1.5
±2
±1
µV
µV/mA
µV
I
SC
Short-Circuit Output Current (Note 6) V
CC
= 5.5V, V
EXTREF
= 2.8V
Code: Zero-Scale, Forcing Output to V
CC
Code: Full-Scale, Forcing Output to GND
l
l
20
20
65
65
mA
mA
V
CC
= 2.7V, V
EXTREF
= 1.4V
Code: Zero-Scale, Forcing Output to V
CC
Code: Full-Scale, Forcing Output to GND
l
l
10
10
40
40
mA
mA
Reference
Reference Output Voltage 1.248 1.25 1.252 V
Reference Temperature Coeffi cient (Note 7) C-Grade Only ±2 ±10 ppm/°C
Reference Line Regulation V
CC
±10% –80 dB
Reference Short-Circuit Current V
CC
= 5.5V, Forcing REFIN/OUT to GND
l
5mA
REFCOMP Pin Short-Circuit Current V
CC
= 5.5V, Forcing REFCOMP to GND
l
200 µA
Reference Load Regulation V
CC
= 3V ±10% or 5V ±10%, I
OUT
= 100µA
Sourcing
40 mV/mA
Reference Output Voltage Noise Density C
REFCOMP
= C
REFIN/OUT
= 0.1µF at f = 1kHz 30 nV/√Hz
Reference Input Range External Reference Mode (Note 14)
l
0.5 V
CC
/2 V
Reference Input Current
l
0.001 1 µA
Reference Input Capacitance (Note 9) 40 pF
Power Supply
V
CC
Positive Supply Voltage For Specifi ed Performance
l
2.7 5.5 V
I
CC
Supply Current (Note 8) V
CC
= 5V, Internal Reference On
V
CC
= 5V, Internal Reference Off
V
CC
= 3V, Internal Reference On
V
CC
= 3V, Internal Reference Off
l
l
l
l
3.1
2.7
3
2.6
4.25
3.7
3.8
3.2
mA
mA
mA
mA
I
SD
Supply Current in Shutdown Mode
(Note 8)
V
CC
= 5V
l
3µA
Digital I/O
V
IL
Low Level Input Voltage
(SDA and SCL)
l
0.3V
CC
V
V
IH
High Level Input Voltage
(SDA and SCL)
l
0.7V
CC
V
V
IL(LDAC)
Low Level Input Voltage (LDAC)V
CC
= 4.5V to 5.5V
l
0.8 V
V
CC
= 2.7V to 4.5V
l
0.6 V
V
IH(LDAC)
High Level Input Voltage (LDAC)V
CC
= 3.6V to 5.5V
l
2.4 V
V
CC
= 2.7V to 3.6V
l
2 V