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SBAS492 – JULY 2015
Electrical Characteristics (continued)
Minimum and maximum specifications are at T
A
= –40°C to 125°C. Typical specifications are at T
A
= 25°C.
AVDD = 5 V, DVDD = 3 V, V
REF
= 4.096 V (internal), and f
SAMPLE
= 500 kSPS, unless otherwise noted.
TEST
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
LEVEL
(1)
INTERNAL REFERENCE OUTPUT
Voltage on REFIO pin
V
(REFIO_INT)
(9)
At T
A
= 25°C
4.094
4.096
4.098
V
A
(configured as output)
Internal reference temperature
8
20
ppm/°C
B
drift
C
(OUT_REFIO)
Decoupling capacitor on REFIO
10
22
µF
B
Reference voltage to ADC
V
(REFCAP)
At T
A
= 25°C
4.094
4.096
4.098
V
A
(on REFCAP pin)
Reference buffer output
0.5
1
Ω
B
impedance
Reference buffer temperature
0.6
1.5
ppm/°C
B
drift
Decoupling capacitor on
C
(OUT_REFCAP)
10
22
μ
F
B
REFCAP
C
(OUT_REFCAP)
= 22 µF,
Turn-on time
15
ms
B
C
(OUT_REFIO)
= 22 µF
EXTERNAL REFERENCE INPUT
External reference voltage on
V
REFIO_EXT
4.046
4.096
4.146
V
C
REFIO (configured as input)
POWER-SUPPLY REQUIREMENTS
AVDD
Analog power-supply voltage
Analog supply
4.75
5
5.25
V
B
Digital supply range
1.65
3.3
AVDD
B
DVDD
Digital power-supply voltage
V
Digital supply range for specified
2.7
3.3
5.25
B
performance
For the ADS8668; AVDD = 5 V, f
S
=
13
16
A
maximum and internal reference
Dynamic,
I
AVDD_DYN
mA
AVDD
For the ADS8664; AVDD = 5 V, f
S
=
8.5
11.5
A
maximum and internal reference
For the ADS8668; AVDD = 5 V,
device not converting and internal
10
12
A
reference
I
AVDD_STC
Analog supply current
Static
mA
For the ADS8664; AVDD = 5 V,
device not converting and internal
5.5
8.5
A
reference
At AVDD = 5 V, device in STDBY
I
STDBY
Standby
3
4.5
mA
A
mode and internal reference
Power-
I
PWR_DN
At AVDD = 5 V, device in PWR_DN
3
20
μ
A
B
down
I
DVDD_DYN
Digital supply current
At DVDD = 3.3 V, output = 0000h
0.5
mA
A
DIGITAL INPUTS (CMOS)
V
IH
0.7 × DVDD
DVDD + 0.3
A
Digital input logic levels
V
DVDD > 2.1 V
V
IL
–0.3
0.3 × DVDD
A
V
IH
0.8 × DVDD
DVDD + 0.3
A
Digital input logic levels
V
DVDD
≤
2.1 V
V
IL
–0.3
0.2 × DVDD
A
Input leakage current
100
nA
A
Input pin capacitance
5
pF
C
DIGITAL OUTPUTS (CMOS)
V
OH
I
O
= 500-
μ
A source
0.8 × DVDD
DVDD
A
Digital output logic levels
V
V
OL
I
O
= 500-
μ
A sink
0
0.2 × DVDD
A
Floating state leakage current
Only for SDO
1
µA
A
Internal pin capacitance
5
pF
C
TEMPERATURE RANGE
T
A
Operating free-air temperature
–40
125
°C
B
(9)
Does not include the variation in voltage resulting from solder-shift and long-term effects.
Copyright © 2015, Texas Instruments Incorporated
9
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