3
LTC1657/LTC1657L
The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 4.5V to 5.5V (LTC1657), VCC = 2.7V to 5.5V (LTC1657L),
VOUT unloaded, REFOUT tied to REFHI, REFLO tied to GND, X1/X2 tied to GND, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Op Amp DC Performance
Short-Circuit Current Low
VOUT Shorted to GND
q
70
120
mA
Short-Circuit Current High
VOUT Shorted to VCC
q
80
140
mA
Output Impedance to GND
Input Code = 0 (LTC1657)
q
40
120
Input Code = 0 (LTC1657L)
q
120
275
Output Line Regulation
Input Code = 65535, LTC1657: VCC = 4.5V to 5.5V
q
4
mV/V
Input Code = 65535, LTC1657L: VCC = 2.7V to 5.5V
q
3
mV/V
AC Performance
Voltage Output Slew Rate
(Note 5)
q
±0.3
±0.7
V/
s
Voltage Output Settling Time
(Note 5) to 0.0015% (16-Bit Settling Time)
20
s
(Note 5) to 0.012% (13-Bit Settling Time)
10
s
Digital Feedthrough
(Note 6)
0.3
nV s
Midscale Glitch Impulse
DAC Switch Between 8000H and 7FFFH
8nV s
Output Voltage Noise Using
X1/X2 Tied to VOUT (Notes 8, 9)
Internal Reference at 1kHz
LTC1657
165
nV/
√Hz
LTC1657L
105
nV/
√Hz
Output Voltage Noise Using
X1/X2 Tied to VOUT (Notes 8, 9, 10)
50
nV/
√Hz
External Reference at 1kHz
Output Voltage Noise Density Using
X1/X2 Tied to VOUT (Notes 8, 9)
8
VP-P
Internal Reference from 0.1Hz to 10Hz
Refererence Input Multiplying BW
700
kHz
Reference Output (REFOUT)
Reference Output Voltage
LTC1657
q
2.036
2.048
2.060
V
LTC1657L
q
1.240
1.250
1.260
V
Reference Output
15
ppm/
°C
Temperature Coefficient
Reference Line Regulation
LTC1657: VCC = 4.5V to 5.5V
q
±1.5
mV/V
LTC1657L: VCC = 2.7V to 5.5V
q
±1.0
mV/V
Reference Load Regulation
Measured at IOUT = 100A (LTC1657)
q
5
mV/A
Measured at IOUT = 100A (LTC1657L)
q
3
mV/A
Short-Circuit Current
REFOUT Shorted to GND
q
50
100
mA
Reference Output Voltage Noise at 1kHz
LTC1657
150
nV/
√Hz
LTC1657L
90
nV/
√Hz
Reference Output Voltage Noise Density
6
VP-P
from 0.1Hz to 10Hz
Reference Input
REFHI, REFLO Input Range
(Note 7) See Applications Information
X1/X2 Tied to VOUT
q
0VCC – 1.5
V
X1/X2 Tied to GND
q
0VCC/2
V
REFHI Input Resistance
LTC1657
q
16
25
k
LTC1657L (Relative to REFLO)
q
16
23
k