Cirrus Logic CS4373A - Manual (Page 6)

CS4373A
6 DS699F2
ANALOG CHARACTERISTICS
Notes: 6. Maximum integrated noise over the measurement bandwidth for the voltage reference device attached
to the VREF ± inputs.
7. Load on the precision OUT ± outputs is normally from the CS3301A / CS3302A amplifiers, which have
1 G
Ω/1 TΩ typical input impedance and 18 pF typical input capacitance.
8. Guaranteed by design and/or characterization.
9. Single-ended output impedance at 1/64 is different for BUF+ and BUF- due to the output attenuator
architecture.
Parameter Symbol Min Typ Max Unit
VREF Input
{VREF+} - {VREF-} ( Note 2, 3 ) VREF - 2.500 - V
VREF- ( Note 4 ) VREF- - VA - - V
VREF Input Current, AC modes VREF
IAC
- 80 - µA
VREF Input Current, DC modes VREF
IDC
- 40 - µA
VREF Input Noise ( Note 6 ) VREF
IN
- - 1 µV
rms
Analog OUT± Output
Analog External Load at OUT ± Load Resistance
( Note 7, 8 ) Load Capacitance
R
LOUT
C
LOUT
50
-
-
- -
50
M Ω
pF
Differential Output Impedance 1/1
1/2
1/4
1/8
1/16
1/32
1/64
ZDIF
OUT
-
-
-
-
-
-
- 1.4
10.1
7.9
5.1
3.3
2.3
1.7
-
-
-
-
-
-
- k Ω
k
Ω
k
Ω
k Ω
k Ω
k
Ω
k
Ω
Single-ended Output Impedance 1/1
1/2
1/4
1/8
1/16
1/32
1/64
ZSE
OUT
-
-
-
-
-
-
- 0.7
7.4
9.0
9.4
9.5
9.5
9.4 -
-
-
-
-
-
- k
Ω
k
Ω
k Ω
k Ω
k
Ω
k
Ω
k Ω
High-Z Impedance ( Note 8 ) HZ
OUT
- 3 - M
Ω
Crosstalk to BUF ± High-Z Output ( Note 8 ) XT
OUT
- -120 - dB
Analog BUF± Output
Analog External Load at BUF ± Load Resistance
( Note 8 ) Load Capacitance
R
LBUF
C
LBUF
1
-
-
- -
2
k
Ω
nF
Differential Output Impedance 1/1 - 1/64 ZDIF
BUF
- 6 -
Ω
Single-ended Output Impedance 1/1 - 1/32
( Note 9 ) (BUF-) 1/64
( Note 9 ) (BUF+) 1/64
ZSE
BUF
-
-
- 3
3
50
-
-
-
Ω
High-Z Impedance ( Note 8 ) HZ
BUF
- 4.5 - M
Ω
Crosstalk to OUT ± High-Z Output ( Note 8 ) XT
BUF
- -120 - dB