STEVAL-CCA002V1 STMicroelectronics, STEVAL-CCA002V1 Datasheet - Page 25

• Manufacturer Part Number: STEVAL-CCA002V1
• Description: BOARD EVAL FOR LP DIFF TS4994IQT
• Manufacturer: STMicroelectronics

Specifications of STEVAL-CCA002V1

• Design Resources: STEVAL-CCA002V1 Gerber Files
• Amplifier Type: Class AB
• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 1W x 1 @ 8 Ohm
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Board Type: Fully Populated
• Utilized Ic / Part: TS4994
• Description/function: Audio Amplifiers
• Operating Supply Voltage: 2.5 V to 5.5 V
• Output Power: 1 W
• Product: Audio Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: TS4994
• Kit Application Type: Amplifier
• Application Sub Type: Audio Power Amplifier
• Kit Contents: Board
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: TS4994
• Other names: 497-6395; STEVAL-CCA002V1

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