LTC1066-1CS Linear Technology, LTC1066-1CS Datasheet - Page 10

• Manufacturer Part Number: LTC1066-1CS
• Manufacturer: Linear Technology

Specifications of LTC1066-1CS

• Architecture: Switched Capacitor
• Order Filter (max): 8th
• Single Supply Voltage (typ): 5/9/12/15V
• Dual Supply Voltage (typ): ±3/±5V
• Power Supply Requirement: Single/Dual
• Single Supply Voltage (min): 4.75V
• Single Supply Voltage (max): 16V
• Dual Supply Voltage (min): ±2.375V
• Dual Supply Voltage (max): ±8V
• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Filter Type: Low Pass Filter
• Lead Free Status / RoHS Status: Not Compliant

DC PERFORMANCE
The DC performance of the LTC1066-1 is dictated by the
DC characteristics of the input precision op amp.
1. DC input voltages in the vicinity of the filter’s half of the
2. The typical DC input voltage ranges are equal to:
3. The filter output DC offset V
4. The V
5. The V
LTC1066-1
APPLICATIONS
10
total power supply are processed with exactly 0dB (or
1V/ V) of gain.
With an input DC voltage range of V
±7.5V), the measured CMRR was 100dB. Figure 1
shows the DC gain linearity of the filter exceeding the
requirements of a 14-bit, 10V full scale system.
input grounded and with dual power supplies. The
V
filter connection shown in the test circuit figure. The
filter output offset is equal to:
(T
using an input resistor R
tor R
increase. For instance, if a 20k resistor is added in series
with pin 3 (see Test Circuit), the output V
OS(OUT)
A
V
V
V
V
> 25°C), and – 7µV/°C (T
IN
IN
IN
OS(OUT)
F
OS(OUT)
, however, the absolute value of V
OS(OUT)
= ±5.8V, V
= ±3.6V, V
= ±1.4V, V
–100
–125
–25
–50
–75
75
50
25
0
is typically ±0.1mV and it is optimized for the
–6 –5
= V
Figure 1. DC Gain Linearity
temperature drift can be improved by
OS
temperature drift is typically 7µV/°C
–4
U
–3
S
S
S
(op amp A) –I
INPUT VOLTAGE (VDC)
= ±7.5V
= ±5V
= ±2.5V
–2
INFORMATION
–1
U
IN
0
OS(OUT)
equal to the feedback resis-
1
A
2
< 25°C).
BIAS
V
T
f
f
CLK
C
S
A
3
= 20kHz
W
= 25°C
= ±7.5V
is measured with the
= 1MHz
4
× R
1066-1 F01
5
IN
F
= 0.1mV (Typ)
OS
6
= ±5V, (V
OS(OUT)
drift will be
U
will
S
=
6. The filter DC output offset voltage V
improved by 2µV/°C to 3µV/°C, however, the V
may increase by 1mV
dent from the filter clock frequency (f
Figures 2 and 3 show the V
different power supplies and for clock frequencies up to
5MHz. Both figures were traced with the LTC1066-1
soldered into the PC board. Power supply decoupling is
very important, especially with ±7.5V supplies. If nec-
essary connect a small resistor (20Ω) between pins 5
and 18, and between pins 10 and 4, to isolate the
precision op amp supply pin from the switched
capacitor network supply (see the Test Circuit).
Figure 2. Output Offset Change vs Clock
(Relative to Offset for f
Figure 3. Output Offset Change vs Clock
(Relative to Offset for f
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7
–0.8
–0.2
–0.4
–0.6
–0.8
–1.0
–1.2
0.2
0.1
0.2
0
0
0 0.5
0 0.5
LINEAR PHASE
T
f
T
f
CLK
CLK
A
A
= 25°C
= 25°C
/f
/f
C
1.0
C
1.0
V
= 100:1
= 50:1
V
CLOCK FREQUENCY (MHz)
CLOCK FREQUENCY (MHz)
S
S
= ±2.5V
1.5
1.5
= ±2.5V
(MAX)
2.0
2.0
2.5
2.5
.
OS(OUT)
CLK
CLK
V
V
3.0
S
3.0
V
S
V
S
= ±7.5V
S
= ±5V
= ±7.5V
= 250kHz)
= 250kHz)
= ±5V
3.5
3.5
OS(OUT)
4.0
4.0
variation for three
CLK
1066-1 F02
1066-1 F03
4.5
4.5
5.0
5.0
≤ 250kHz).
is indepen-
OS(OUT)
10661fa