U4082B-DEV-BOARD Atmel, U4082B-DEV-BOARD Datasheet - Page 3

• Manufacturer Part Number: U4082B-DEV-BOARD
• Description: WiFi / 802.11 Modules & Development Tools Voice Switched Circuit
• Manufacturer: Atmel

2. Pin Configuration
Figure 2-1.
Table 2-1.
4743D–CORD–03/06
Pin
10
11
12
13
14
1
2
3
4
5
6
7
8
9
Pinning SO28
Pin Description
Symbol
MUTE
HTO+
HTO–
MICO
MIC
HTI
VCI
FO
CD
VS
TO
CT
FI
TI
Filter output. Output impedance is less than 50
Filter input. Input impedance is greater than 1 M
Chip disable. A logic low (< 0.8V) sets normal operation. A logic high (> 2V) disables the IC to conserve
power. Input impedance is nominally 90 k
Supply voltage 2.8V to 6.5V, approximately 5 mA. AGC circuit reduces the receive attenuator gain at
25 dB, receive mode at 2.8V
Output of the second hybrid amplifier (Hybrid output). Gain is internally set at –1 to provide a differential
output, (in conjunction with HTO–) to the hybrid transformer
Output of the first hybrid amplifier. Hybrid output. Gain is set by external resistors
Input and summing node for the first hybrid amplifier. DC level is approximately V
Transmit attenuator output. DC level is approximately V
Transmit attenuator input. Maximum signal level is 350 mVrms. Input impedance is approximately 10 k
Microphone amplifier output. Gain is set by external resistors
Microphone amplifier input. Bias voltage is approximately V
Mute input. A logic low (< 0.8V) sets normal operation. A logic high (> 2V) mutes the microphone
amplifier without affecting the rest of the circuit. Input impedance is nominally 90 k
Volume control input. When VCI = V
When VCI = 0.3 V
Response time. An RC at this pin sets the response time for the circuit to switch modes
Function
B
, the receive gain is down 35 dB. It does not affect the transmit mode
CD
VS
HTO+
HTO-
HTI
FO
FI
TO
TI
MICO
MIC
MUTE
CT
VCI
11
12
13
10
14
1
2
3
4
5
6
7
8
9
B
, the receive attenuator is at maximum gain when in receive mode.
15
28
27
26
25
23
21
20
19
18
17
16
24
22
TLO2
GND
CPR
RLI1
RLO1
TLO1
TLI1
RECO
RI
RLI2
RLO2
TLI2
CPT
VB
B
B
B
U4082B
3