ZSBI010SZ000SC Zilog, ZSBI010SZ000SC Datasheet - Page 17

• Manufacturer Part Number: ZSBI010SZ000SC
• Description: IC ASSP PIR AMPLIFIER 8-SOIC
• Manufacturer: Zilog
• Type: Sensor Interfacer

Specifications of ZSBI010SZ000SC

• Applications: Passive Infrared (PIR)
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 269-3120

5.2 PIR A
F
PS002301-SEC1099
IGURE
Input
5. C
ONNECTIVITY OF
MPLIFIER
R
f
B
PIR A
A ZSBI010, as used in the PIR AmpliÞer Block, yields the following beneÞts:
1. High performance in a simple design
2. Less external components required
3. Reliability and stability
The PIR AmpliÞer Block can also be directly connected to the output of the PIR
Sensor Block without an AC-coupling capacitor. Figure 5 illustrates the connec-
tivity of the PIR AmpliÞer block. The gain of the ampliÞer is calculated as:
The recommended value for R
The gain is 66.6 dB.
The ZSBI010 also features an Adjustable Digital Filter (a low-pass Þlter), which
is used for Þltering out the DC bias from the PIR sensor. This Þlter returns the DC
signal, in the range 0Ð0.1 Hz, as feedback from the ampliÞer output to the V
pin to cancel the DC bias from the PIR sensor. The cutoff frequency (F
low-pass Þlter is calculated as:
F
LOCK
LOW
R
PIR A
Gain = 1 + (R
|Gain| (dB) = 20 log |Gain|
i
MPLIFIER
= ([R
= (0.2 x R3 x R
MPLIFIER
f
1
2
3
4
B
÷ R
LOCK
OUT
V +
V –
DC Bias Cancellation
IN
IN
ZSBI010 PRELIMINARY
i
] x [0.5 x R3 ÷ 2.5]) ÷ (4 x 2 x 2
f
B
÷ R
LOCK
f
i
)
) ÷ (4 x 2 x 2
f
is 1 M ; the recommended value for R
GND
OSC
C
V
DAC
DD
34
5
6
7
8
x R
R1
i
)
C1
S
YSTEM
34
V
)
DD
D
ESIGN
R3
C2
C
ONSIDERATIONS
i
C
is 470 .
) of the
Output
IN
Ð
17