ADA4430-1 Analog Devices, ADA4430-1 Datasheet - Page 13

• Manufacturer Part Number: ADA4430-1
• Description: Ultralow Power Video Filter
• Manufacturer: Analog Devices

USABLE INPUT VOLTAGE RANGE
The output voltage range of the ADA4430-1 limits its usable
input voltage range. The lower end of the input range is
typically 0 V. The upper end of the usable input voltage
range is calculated as
where:
V
V
V
IN
OM
OO
(max) is the upper end of the usable input voltage range.
is the output-referred offset voltage.
is the maximum output swing.
V
IN
(max) = (V
OM
− V
OO
)/2
Rev. A | Page 13 of 16
SAG CORRECTION FREQUENCY RESPONSE
When using the SAG corrected circuit, the gain from the input
to the immediate output of the ADA4430-1 is ×2.5 (≈8 dB) at
extremely low frequencies where the outer feedback loop
formed by the 22 μF capacitor effectively opens (see Figure 29)
and exhibits a second-order peak of approximately 11 dB in the
neighborhood of 5 Hz. This gain is approximately 7.5 dB at
30 Hz. The extra gain must be accounted for when considering
low frequency input and output signal swings to keep them
within their specified limits. The gain from the ADA4430-1
input to the load side of the 47 μF capacitor does not exhibit
this behavior, rather it appears more like a single-pole high-
pass response. Figure 32 illustrates the SAG frequency response
immediately at the ADA4430-1 output and at the load side of the
47 μF capacitor.
Figure 32. SAG Corrected Frequency Response at ADA4430-1 Output and
–10
12
10
–2
–4
–6
–8
8
6
4
2
0
1
at the Load Side of the 47 μF Capacitor
10
FREQUENCY (Hz)
100
AT ADA4430-1 OUTPUT
AT LOAD SIDE OF 47µF CAPACITOR
1000
ADA4430-1
10000
100000