AS1520/AS1521
Data Sheet - Electrical Characteristics
Table 4. AS1521 Electrical Characteristics (Continued)
Symbol
Parameter
Conditions
Min
Typ
Max Units
REF Output
Temperature Coefficient
ppm/
°C
TCVREF
±25
mV/
Load Regulation 7
0 to 0.75mA output load
0.6
2.0
mA
CBYPREF Capacitive Bypass at REF
4.7
10
µF
Capacitive Bypass
at REFADJ
CBYPREF
ADJ
0.01
10
µF
REFADJ Output Voltage
REFADJ Input Range
1.22
V
For small adjustments, from 1.22V
To power down the internal reference
±100
mV
REFADJ Buffer
Disable Threshold
VDD1
1.4
1.0
V
- 1
Buffer Voltage Gain
2.045
200
V/V
External Reference: Reference buffer disabled, reference applied to REF
VDD1 +
50mV
REF Input Voltage Range 8
VREF = 2.50V, fSCLK= 4.8MHz
V
350
320
5
REF Input Current
VREF = 2.50V, fSCLK = 0
In power-down, fSCLK = 0
µA
Digital Inputs: DIN, SCLK, CSN
0.7 x
VDD
VINH
VINL
Input High Voltage
Input Low Voltage
V
V
0.3 x
VDD
VHYST
IIN
Input Hysteresis
Input Leakage
0.8
5
V
VIN = 0 or VDD2
-1
+1
µA
pF
CIN
Input Capacitance
Digital Outputs: DOUT, SSTRB
VOL
VOH
IL
Output Voltage Low
ISINK = 5mA
ISOURCE = 0.5mA
CSN = VDD2
0.45
+10
V
V
VDD2 -
0.5V
Output Voltage High
Tri-State Leakage Current
-10
µA
pF
Tri-State Output
Capacitance
COUT
CSN = VDD2
5
Power Supply
VDD1,
VDD2,
Positive Supply Voltage 9
2.7
3.6
2.7
V
VDD3
Normal Operation
with External
2.2
2.7
Reference 10
Normal Operation
with Internal
IVDD1,
IVDD2,
IVDD3
3.2
VDD1 = VDD2 =
VDD3 = 5.5V
Reference 10
Reduced-Power
Mode 11
Supply Current
mA
0.4
0.5
0.8
2
Full Power-Down
Mode 11
µA
VDD1 = VDD2 = VDD3
= 2.7 to 3.6V,
Mid-Scale Input
±0.1
+2
mV
PSR
Power-Supply Rejection
-2
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