CT8022 Datasheet, PDF (173/194 Pages) List of Unclassifed Manufacturers – VOIP/VON G.723.1, G279AB TRUESPEECH CO-PROCESSOR

Version: 1.18
PRELIMINARY/CONFIDENTIAL
TrueSpeech® Co-Processor
Table 12-3: Electrical Characteristics Over Recommended Operating Free-Air Temperature Range
(Unless Otherwise Noted)
PARAMETER
TEST
MIN
CONDITIONS
VOH high level output voltage
VOL low level output voltage
IOZ off state output current
II input current
(pins without pull down resistors)
VCC = 5V
2.4
VCC = Max
II input current
(pins with pull down resistors)
ICC Supply Current
Operating Mode f = 45.056 MIPS
Stop Device
Mode
VCC = 5V
No Clock
VCC = 5V
25 °C
all inputs GND
all outputs NC
CI Input capacitance
TYP
MAX UNIT
V
0.6
V
20
µA
±20
µA
+20
µA
-60
mA
0.5
2
mA
50
uA
20
pF
Table 12-4: DTMF & Tone Generation Characteristics
PARAMETER
DTMF twist (high/low tone)
Tone generator frequency accuracy
Tone generator level*
Tone generator level accuracy
MIN
TYP
MAX
2
±8
-0.1
+0.1
-24
+6
-0.5
+0.5
* 0 dB0 is 0.707 VRMs programmable with 2 dB resolution. Assumes FSYNC = 8.000 KHz
UNIT
dB
%fc
dB0
dB
Table 12-5: Acoustic Echo Canceller Performance
PARAMETER
Acoustic Echo Cancellation
Max echo delay
30 dB
10ms
NOTE
1
2, 3
Notes:
1. The acoustic echo canceller achieves 30 dB of cancellation for white noise in less than 1.0 seconds with the
speaker CODEC output connected to the microphone CODEC input via a 2:1 attenuator and an output
level equivalent to -10 dBm0.
2. The acoustic echo canceller can cancell echos up to 10ms (approximately 3.4 meters or 11 feet in sound
propagation.
3. Assumes operation of CODEC at 8.0 KHz sample rate.
CT8022A11AQC FW Revision 0118
DSP GROUP, INC., 3120 SCOTT BOULEVARD
173
SANTA CLARA, CA 95054 PH: 408 986 – 4300 FAX: 408 986 – 4490
All specifications are subject to change without prior notice.