SAF7841HL/M295,557 NXP Semiconductors, SAF7841HL/M295,557 Datasheet - Page 7

• Manufacturer Part Number: SAF7841HL/M295,557
• Description: IC HD RADIO PROCESSOR 144HLQFP
• Manufacturer: NXP Semiconductors

Specifications of SAF7841HL/M295,557

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 935288157557

NXP Semiconductors
TDA8954_1
Product data sheet
The smooth transition between Mute and Operating modes causes a gradual increase in
the DC offset output voltage, which becomes inaudible (no pop noise because the DC
offset voltage rises smoothly). An overview of the start-up timing is provided in
For proper switch-off, the MODE pin should be forced LOW at least 100 ms before the
supply lines (V
Fig 5.
(1) First
2.2 V < V
2.2 V < V
Upper diagram: When switching from Standby to Mute, there is a delay of approximately 100 ms
before the output starts switching. The audio signal will become available once V
Operating mode level (see
pop noise-free, it is recommended that the time constant applied to pin MODE be at least 350 ms
for the transition between Mute and Operating modes.
Lower diagram: When switching directly from Standby to Operating mode, there is a delay of
100 ms before the outputs start switching. The audio signal becomes available after a second
delay of 50 ms. To start-up pop noise-free, it is recommended that the time-constant applied to pin
MODE be at least 500 ms for the transition between Standby and Operating modes.
Timing on mode selection input pin MODE
1
⁄
4
DD
MODE
MODE
0 V (SGND)
0 V (SGND)
pulse down.
and V
> 4.2 V
> 4.2 V
V
V
MODE
< 3 V
MODE
< 3 V
Rev. 01 — 24 December 2009
SS
) drop below 12.5 V.
standby
standby
Table
9), but not earlier than 150 ms after switching to Mute. To start-up
duty cycle
duty cycle
100 ms
100 ms
50 %
50 %
mute
mute
(1)
(1)
50 ms
50 ms
2 × 210 W class-D power amplifier
modulated PWM
modulated PWM
audio output
audio output
operating
operating
> 350 ms
> 350 ms
TDA8954
© NXP B.V. 2009. All rights reserved.
MODE
001aah657
time
time
reaches the
Figure
7 of 46
5.