U4091BM-RFNY19 Atmel, U4091BM-RFNY19 Datasheet - Page 20

• Manufacturer Part Number: U4091BM-RFNY19
• Description: RF Wireless Misc COM.CORDED - FEATURE PHONE CIRCUIT
• Manufacturer: Atmel
• Type: Programmable Telephone Audio Processorr

Specifications of U4091BM-RFNY19

• Operating Frequency: 100 KHz
• Operating Temperature Range: - 55 C to +150 C
• Package / Case: SSO-44
• Mounting Style: SMD/SMT

12.4
20
Term Definitions
Atmel U4091BM-R
Table 12-1.
Note:
LOGT > CLOGR
LOGT < CLOGR
LOGR < CLOGT
LOGR > CLOGT
BNMT detects speech
BNMT detects noise
BNMR detects speech
BNMR detects noise
1. Transmit means the transmit attenuator is fully on, and the receive attenuator is at
2. Receive means the receive attenuator is fully on, and the transmit attenuator is at
3. In idle mode, the transmit and receive attenuator are at half of their maximum
4. Switching to full transmit or receive modes from the idle mode is done at a fast rate
maximum attenuation.
maximum attenuation.
attenuation.
– Change mode means both the transmit and receive speech are present in
– Idle means speech has ceased in both transmit and receive paths. The
(30ms).
approximately equal levels. The attenuators are quickly switched (30ms) to the
opposite mode until one speech level dominates the other.
attenuators are then slowly switched (1.5s) to idle mode.
X = don’t care; Y = I3 and I4 are not both noise.
I1
R
R
R
R
T
T
T
T
Mode Decision for Signal Sensing
I3 = S
I4 = S
I1 = T
I1 = R
I2 = T
I2 = R
I3 = N
I4 = N
I2
R
R
R
R
T
T
T
T
Input
I3
S
Y
Y
X
N
N
N
X
I4
X
Y
Y
S
X
N
N
N
Output
Mode
Transmit
Change mode
Change mode
Receive
Idle
Idle
Idle
Idle
4872B–CORD–01/11