Datasheet

3
LTC1821
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= T
MIN
to T
MAX
,
V
+
= 15V, V
–
= –15V, V
CC
= 5V, V
REF
= 10V, AGNDF = AGNDS = DGND = 0V.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Input
R
REF
DAC Input Resistance (Unipolar) (Note 6) ● 4.5 6 10 kΩ
R1/R2 R1/R2 Resistance (Bipolar) (Notes 6, 11) ● 91220 kΩ
R
OFS
, R
FB
Feedback and Offset Resistances (Note 6) ● 91220 kΩ
AC Performance (Note 4)
Output Voltage Settling Time ∆V
OUT
= 10V (Notes 7, 8) 2 µs
Midscale Glitch Impulse (Note 10) 2 nV•s
Digital-Feedthrough (Note 9) 2 nV•s
Multiplying Feedthrough Error V
REF
= ±10V, 10kHz Sine Wave (Note 7) 1 mV
P-P
Multiplying Bandwidth Code = Full Scale (Note 7) 600 kHz
Output Noise Voltage Density 1kHz to 100kHz (Note 7)
Code = Zero Scale 13 nV/√Hz
Code = Full Scale 20 nV/√Hz
Output Noise Voltage 0.1Hz to 10Hz (Note 7)
Code = Zero Scale 0.45 µV
RMS
Code = Full Scale 1 µV
RMS
1/f Noise Corner (Note 7) 30 Hz
Analog Outputs (Note 4)
V
OUT
DAC Output Swing R
L
= 2k, V
+
= 15V, V
–
= –15V ● ±12.6 V
R
L
= 2k, V
+
= 5V, V
–
= –5V ● ±2.6 V
DAC Output Load Regulation V
+
= 15V, V
–
= –15V, ±5mA Load ● 0.02 0.2 LSB/mA
I
SC
Short-Circuit Current V
OUT
= 0V, V
+
= 15V, V
–
= –15V ● 12 40 mA
SR Slew Rate R
L
= 2k, V
+
= 15V, V
–
= –15V 20 V/µs
R
L
= 2k, V
+
= 5V, V
–
= –5V 14 V/µs
Digital Inputs
V
IH
Digital Input High Voltage ● 2.4 V
V
IL
Digital Input Low Voltage ● 0.8 V
I
IN
Digital Input Current ● 0.001 ±1 µA
C
IN
Digital Input Capacitance (Note 4 ) V
IN
= 0V ● 8pF
Timing Characteristics
t
DS
Data to WR Setup Time ● 60 20 ns
t
DH
Data to WR Hold Time ● 0–12 ns
t
WR
WR Pulse Width ● 60 25 ns
t
LD
LD Pulse Width ● 110 55 ns
t
CLR
Clear Pulse Width ● 60 40 ns
t
LWD
WR to LD Delay Time ● 0ns
Power Supply
I
CC
Supply Current, V
CC
Digital Inputs = 0V or V
CC
● 1.5 10 µA
I
S
Supply Current, V
+
, V
–
±15V ● 4.5 7.0 mA
±5V
● 4.0 6.8 mA
V
CC
Supply Voltage ● 4.5 5 5.5 V
V
+
Supply Voltage ● 4.5 16.5 V
V
–
Supply Voltage ● –16.5 –4.5 V