LTC1566-1
7
15661fa
Noise
The wideband noise of the filter is the RMS value of the
output noise power spectral density integrated over a
given bandwidth. Since the filter has a DC gain of 4, the
wideband noise is divided by 4 when referred to the input.
The input referred wideband noise is used to determine the
signal-to-noise ratio at a given distortion level and hence
the spurious free dynamic range. Most of the noise is
concentrated in the filter passband and cannot be removed
with post filtering (Table 1). The noise is mostly indepen-
dent of supply level (Table 2).
Table 1. Input Referred Wideband Noise vs Bandwidth,
Single 5V Supply
BANDWIDTH TOTAL INTEGRATED NOISE
50kHz to 2MHz 62µV
RMS
50kHz to 4MHz 76µV
RMS
Table 2. Input Referred Wideband Noise vs Supply Voltage,
50kHz to 2MHz
BANDWIDTH TOTAL INTEGRATED NOISE
V
S
= 5V 62µV
RMS
V
S
= ±5V 63µV
RMS
PIN 5 DC VOLTAGE (V)
THD (dB)
–30
–40
–50
–60
–70
–80
–90
2–2 3
1566-1 F06
–3 10–1
4
V
S
= 5V
V
S
= ± 5V
FREQUENCY (Hz)
10k
2.5
0
–2.5
100k 1M 10M
1566-1 F07
GAIN
PIN 8 – PIN 7
(dB)
PIN 5
V
S
= 5V
V
S
= ± 5V
V
IN
= 200mV
P-P
Figure 6
Figure 7
APPLICATIO S I FOR ATIO
WUU
U
PACKAGE DESCRIPTIO
U
Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.016 – 0.050
(0.406 – 1.270)
0.010 – 0.020
(0.254 – 0.508)
×
45
°
0
°
– 8
°
TYP
0.008 – 0.010
(0.203 – 0.254)
SO8 1298
0.053 – 0.069
(1.346 – 1.752)
0.014 – 0.019
(0.355 – 0.483)
TYP
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
BSC
1
2
3
4
0.150 – 0.157**
(3.810 – 3.988)
8
7
6
5
0.189 – 0.197*
(4.801 – 5.004)
0.228 – 0.244
(5.791 – 6.197)
DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
*
**
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
