Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

AD1991ASVRL Datasheet(PDF) 6 Page - Analog Devices

Part # AD1991ASVRL
Description  Class D/1-Bit Audio Power Output Stage
Download  11 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD1991ASVRL Datasheet(HTML) 6 Page - Analog Devices

Back Button AD1991ASVRL Datasheet HTML 2Page - Analog Devices AD1991ASVRL Datasheet HTML 3Page - Analog Devices AD1991ASVRL Datasheet HTML 4Page - Analog Devices AD1991ASVRL Datasheet HTML 5Page - Analog Devices AD1991ASVRL Datasheet HTML 6Page - Analog Devices AD1991ASVRL Datasheet HTML 7Page - Analog Devices AD1991ASVRL Datasheet HTML 8Page - Analog Devices AD1991ASVRL Datasheet HTML 9Page - Analog Devices AD1991ASVRL Datasheet HTML 10Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 6 / 11 page
background image
REV. 0
–6–
AD1991
FUNCTIONAL DESCRIPTION
Device Architecture
The AD1991 is an 8-transistor, audio, power output stage. The
AD1991 is arranged internally as four transistor pairs that can
be used as two H-bridge outputs (2-channel mode) or as four
single-ended outputs (4-channel mode), using either two or four
TTL compatible inputs to control the transistors. A dead time
is automatically provided between the switching of the high-
side transistor and low-side transistor when the control inputs
change level, to ensure that both the high-side transistor and
low-side transistor are never on at the same time.
Clock Source and Channel Mode Selection
When the AD1991 is brought out of reset, the logic levels on
MODE0 and MODE1 are latched internally. MODE0 determines
the internal state machine clock source. MODE1 determines the
channel mode and the function of
ERR0 (see Tables I and II.)
When the internal clock is used, the CLK pin should not be
connected.
Table I. Clock Source Selection
MODE0
CLK Source
0
Internal
1External
Table II. Channel Mode Selection
MODE1
Channel Mode
ERR0 Function
0
2-Channel Mode
Data Loss Detection Output
1
4-Channel Mode
Low-Side Disable Input
2-Channel Mode
Two loads are connected differentially—across OUTA and OUTB
and across OUTC and OUTD. Inputs INB and IND are unused
and should be tied to an appropriate dc voltage (see the Edge
Speed and Nonoverlap Settings section). In this mode,
ERR0 is
an error output used to indicate data loss, which occurs when
there are no transitions on INA or INC for more than 50 ms.
This signal condition is hazardous in 2-channel mode because it
can cause a potentially large and harmful dc voltage across the
differential loads. Table III shows the input/output relationship.
Table III. Input/Output Relationship in 2-Channel Mode
Input
Controlled Output
INA
OUTA, OUTB
INC
OUTC, OUTD
4-Channel Mode
The 4-channel mode has two types of configuration: audio and
power supply. Neither of these configurations require data loss
detection. In the audio configuration, each single-ended load is
connected to the output through a blocking capacitor, which
prevents dc from reaching the load, thereby negating the need
for data loss detection. While in the power supply configuration,
it is desired to maintain a dc voltage on the load, also negating
the need for data loss detection. When used in the power supply
configuration, the four low-side transistors can also be disabled
and left permanently open if desired. This allows the loads to be
driven by switching only the high-side transistor on and off.
ERR0 is an input in 4-channel mode and is used to select
whether the four low-side transistors are enabled or disabled,
with 0 selecting disabled and 1 selecting enabled. Table IV
summarizes the function of
ERR0 in this mode. Table V shows
the input/output relationship.
Table IV.
ERR0 Function in 4-Channel Mode
ERR0
Low-Side Transistor Status
0
Disabled
1
Enabled
Table V. Input/Output Relationship in 4-Channel Mode
Input
Controlled Output
INA
OUTA
INB
OUTB
INC
OUTC
IND
OUTD
1-Channel Mode
One load is connected differentially—across OUTA and OUTC,
and OUTB and OUTD. This mono operation is established
by configuring the part for 2-channel mode and externally
connecting INA to INC, OUTA to OUTC, and OUTB to
OUTD (see Figure 4).
Thermal Protection
The AD1991 features thermal protection. When the die tempera-
ture exceeds approximately 135
°C, the thermal warning error
output (
ERR2) is asserted. If the die temperature exceeds
approximately 150
°C, the thermal shutdown error output (ERR3)
is asserted. If this occurs, the part shuts down to prevent damage
to the part. When the die temperature drops below approximately
120
°C, both error outputs de-assert and the part returns to nor-
mal operation.
Overcurrent Protection
The AD1991 features overcurrent or short-circuit protection. If
the current through any power transistors exceeds 5 A, the part
is muted and the overcurrent error output (
ERR1) is asserted.
This is a latched error and does not clear automatically. To clear
the error condition and restore normal operation, the part must
be reset or
MUTE must be asserted and de-asserted.


Similar Part No. - AD1991ASVRL

ManufacturerPart #DatasheetDescription
logo
Analog Devices
AD1991 AD-AD1991_15 Datasheet
206Kb / 12P
   Class D/1-Bit Audio Power Output Stage
REV. 0
More results

Similar Description - AD1991ASVRL

ManufacturerPart #DatasheetDescription
logo
Analog Devices
AD1991 AD-AD1991_15 Datasheet
206Kb / 12P
   Class D/1-Bit Audio Power Output Stage
REV. 0
ADAU1513 AD-ADAU1513 Datasheet
472Kb / 16P
   Class-D Audio Power Stage
REV. 0
ADAU1513 AD-ADAU1513_15 Datasheet
1Mb / 16P
   Class-D Audio Power Stage
REV. 0
logo
Texas Instruments
TPA2025D1 TI1-TPA2025D1_14 Datasheet
1Mb / 29P
[Old version datasheet]   Constant Output Power Class-D Audio Amplifier
TPA2080D1 TI1-TPA2080D1_16 Datasheet
1Mb / 29P
[Old version datasheet]   Constant Output Power Class-D Audio Amplifier
TPA2015D1 TI1-TPA2015D1 Datasheet
1Mb / 33P
[Old version datasheet]   Constant Output Power Class-D Audio Amplifier
TPA2013D1 TI1-TPA2013D1_16 Datasheet
1Mb / 40P
[Old version datasheet]   Constant Output Power Class-D Audio Amplifier
logo
Princeton Technology Co...
PT2001 PTC-PT2001 Datasheet
250Kb / 4P
   2.2W횞2 Class-D Audio Power Amp. 2.2W횞2 Class-D Audio Power Amp. with Headphone Output
logo
List of Unclassifed Man...
LC551 ETC1-LC551 Datasheet
66Kb / 3P
   High Power Class B Output Stage
GS551 ETC1-GS551 Datasheet
96Kb / 4P
   High Power, Class B Output Stage
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com