Datasheet

LTC2657
7
2657f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OUT
DAC Output Span Internal Reference
External Reference = V
EXTREF
0 to 4.096
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 
DC Crosstalk 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 4) 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
Reference
Reference Output Voltage 2.044 2.048 2.052 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 35 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)
l
40 pF
Power Supply
V
CC
Positive Supply Voltage For Specifi ed Performance
l
4.5 5.5 V
I
CC
Supply Current (Note 8) V
CC
= 5V, Internal Reference On
V
CC
= 5V, Internal Reference Off
l
l
3.3
3
4.25
3.7
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
0.8V V
V
IH(LDAC)
High Level Input Voltage (LDAC) V
CC
= 4.5V to 5.5V
l
2.4 V
V
IL(CA)
Low Level Input Voltage (CA0 to CA2) See Test Circuit 1
l
0.15V
CC
V
V
IH(CA)
High Level Input Voltage (CA0 to CA2) See Test Circuit 1
l
0.85V
CC
V
R
INH
Resistance from CA
n
(n = 0,1, 2)
to V
CC
to Set CA
n
= V
CC
See Test Circuit 2
l
10 k
R
INL
Resistance from CA
n
(n = 0,1, 2)
to GND to Set CA
n
= GND
See Test Circuit 2
l
10 k
R
INF
Resistance from CA
n
(n = 0,1, 2)
to V
CC
or GND to Set CA
n
= FLOAT
See Test Circuit 2
l
2M
V
OL
Low Level Ouput Voltage Sink Current = 3mA
l
0 0.4 V
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
= 4.5V to 5.5V, V
OUT
unloaded unless otherwise specifi ed.
LTC2657B-H16/LTC2657-H12 (Internal Reference = 2.048V)