TS4994IST STMicroelectronics, TS4994IST Datasheet - Page 25
TS4994IST
Manufacturer Part Number
TS4994IST
Description
IC AMP AUDIO PWR 1W MONO 8MSOP
Manufacturer
STMicroelectronics
Type
Class ABr
Datasheet
1.TS4994IST.pdf
(35 pages)
Specifications of TS4994IST
Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
1W x 1 @ 8 Ohm
Voltage - Supply
2.5 V ~ 5.5 V
Features
Depop, Differential Inputs, Short-Circuit and Thermal Protection, Standby
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
For Use With
497-6396 - BOARD EVAL FOR LV TS4984IQT497-6395 - BOARD EVAL FOR LP DIFF TS4994IQT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-4452-2
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
TS4994IST
Manufacturer:
ST
Quantity:
20 000
TS4994
4.6
Figure 73. PSRR vs. frequency with random
-100
-110
-120
-130
-140
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
20
Vcc = 5V, Vripple = 200mVpp
Av = 1, Cin = 4.7 μ F
Δ R/R ≤ 0.1%, RL ≥ 8 Ω
Tamb = 25 ° C, Inputs = Grounded
The two following graphs show typical applications of the TS4994 with a random selection of
four
CMRR performance
For calculating CMRR performance, we consider that C
has no influence in the calculation of the CMRR.
We use the same kind of resistor (same tolerance) and ΔR is the tolerance value in %.
The following CMRR equation is valid for frequencies ranging from DC to about 1kHz.
The CMRR equation is (ΔR in %):
Example: With ΔR = 1%, the minimum CMRR is -34dB.
This example is a worst case scenario where each resistor has extreme tolerance. Ut
illustrates the fact that for CMRR, good matching is essential.
As with the PSRR, due to self-generated noise, the TS4994 CMRR limitation is about
-110dB.
Figure 75
worst-case conditions (ΔR=0.1%).
choice condition
Cb=1 μ F
100
Δ
R/R values with a 0.1% tolerance.
Cb=0.1 μ F
and
Cb=0.47 μ F
Frequency (Hz)
Figure 76
1000
Cb=0
show CMRR versus frequency and versus bypass capacitor C
CMRR
10000
≤
20k
20
×
Log
Figure 74. PSRR vs. frequency with random
⎡
⎢
⎣
(
-100
-110
-120
-130
-140
10000
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
Δ
20
R
×
Vcc = 2.5V, Vripple = 200mVpp
Av = 1, Cin = 4.7 μ F
Δ R/R ≤ 0.1%, RL ≥ 8 Ω
Tamb = 25 ° C, Inputs = Grounded
−
200
choice condition
Δ
Cb=1 μ F
R
in
100
2
)
and C
⎤
⎥
⎦
Cb=0.1 μ F
(
dB
Cb=0.47 μ F
Frequency (Hz)
feed
)
Application information
have no influence. C
1000
Cb=0
10000
20k
25/35
b
b
in