View RB-TA2021_197703.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Tr i path Technol ogy, I nc. -
Technical Information
RB-TA2021 CLASS-T DIGITAL AUDIO AMPLIFIER 6 CHANNEL TA2021 REFERENCE DESIGN
Technical Information Board Rev. 1.7 Revision 1.0 - December 2002
GENERAL DESCRIPTION
The RB TA2021 Version 1.7 is a 6 channel, 20W per channel audio amplifier designed to provide a simple and straightforward environment for the evaluation of the TA2021 amplifier. For additional documentation on the TA2021, see the TA2021 Data Sheet (www.tripath.com). APPLICATIONS DVD Receivers Mini/Micro Component Systems Computer / PC Multimedia Cable Set-Top Products Televisions BENEFITS Integrated solution with internal FETs Improved efficiency over Class-AB amps Simplifies thermal management Signal Quality equal to linear amplifiers FEATURES High Power: 6 X 20W @ 4 Single Supply Operation Low Noise Floor: 120uV A-weighted Low Distortion: 0.05% THD+N @ 10W 4 High Efficiency: 81% for 4 loads Dynamic Range = 100dB Mute and Sleep inputs Over-Current Protection Over and Under Voltage Protection Over Temperature Protection
1
RB-TA2021 Six Channel - CS/Rev. 1/12.02
Tr i path Technol ogy, I nc. -
Technical Information
OPERATING INSTRUCTIONS
EVALUATION BOARD DIAGRAM
POWER SUPPLIES The TA2020 requires a +13.5V power supply to operate. Power to the board is provided via HDR1, a 2 pin 0.156" spaced header. The minimum operating voltage is 8.5V and the maximum operating voltage is 14.6V. Under and over-voltage protection circuits will cause the amplifier to mute if these conditions are not followed. Header Label VCC GND Description Positive of the 13.5V Power supply Negative (GND) of 13.5V Power Supply
Warning: Do not exceed Maximum Operating Supply Voltage of 14.6V OUTPUT The output connections, JP3, JP3B and JP3C, are 4-Pin 0.156" spaced headers. The female terminal housing for this header is Molex 09-50-8041. The outputs of the TA2021 are differential (bridged). Therefore, each channel requires two wires to connect a speaker, neither of which is ground. JP3 pin # 1 2 3 4 Connection OUTP2 (ch1) OUTM2 (ch1) OUTM1 (ch2) OUTP1 (ch2) JP3B pin # 1 2 3 4 Connection OUTP2 (ch3) OUTM2 (ch3) OUTM1 (ch4) OUTP1 (ch4) JP3C pin # 1 2 3 4 Connection OUTP2 (ch5) OUTM2 (ch5) OUTM1 (ch6) OUTP1 (ch6)
2
RB-TA2021 Six Channel - CS/Rev. 1/12.02
Tr i path Technol ogy, I nc. -
Technical Information
INPUT The input connection, JP1, is a 7-Pin 0.100" spaced header. The female terminal housing for this header is Molex 22-01-2077. The six inputs share a common ground referenced to AGND. JP1 Connector Pin# Pin1 Pin2 Pin3 Pin4 Pin5 Pin6 Pin7 JUMPER SETTINGS (MUTE and SLEEP) There are three 2-pin headers for the MUTE control of the TA2021s. If the jumpers are removed, the channels will be muted. If the jumpers are in place, the channels will be muted if the FAULT pin outputs a logic high. A logic high on the FAULT pin indicates an over-current, over-temperature, over-voltage or under-voltage condition. There are three 2-pin headers for the SLEEP control of the TA2021s. If the jumpers are removed, the channels will be in sleep mode. If the jumpers are in place, the channels will operate properly. Note: All jumpers should be in place for normal amplifier operation. GAIN SETTING The gain of each channel of the TA2021 is set to 12V/V. It may be adjusted by the ratio of two external resistors, RI and RF, and is defined by the following formula: V0/VI = 12*(RF/RI). VI is the input signal level and VO is the differential output signal level (see the top level schematic for more details). Performing Measurements on the TA2021 The TA2021 operates by generating a high frequency switching signal based on the audio input. This signal is sent through a low-pass filter that recovers an amplified version of the audio input. The frequency of the switching pattern is spread spectrum in nature and typically varies between 100kHz and 1MHz, which is well above the 20Hz - 20kHz audio band. The pattern itself does not alter or distort the audio input signal, but it does introduce some inaudible components. The measurements of certain performance parameters, particularly noise related specifications such as THD+N, are significantly affected by the design of the low-pass filter used on the output as well as the bandwidth setting of the measurement instrument used. Unless the filter has a very sharp roll-off just beyond the audio band or the bandwidth of the measurement instrument is limited, some of the inaudible noise components introduced by the TA2021 amplifier switching pattern will degrade the measurement by including out of band (audio) energy. One feature of the TA2021 is that it does not require large multi-pole filters to achieve excellent performance in listening tests, usually a more critical factor than performance measurements. Though using a multi-pole filter may remove high-frequency noise and improve THD+N type measurements (when they are made with wide-bandwidth measuring equipment), these same filters degrade frequency response. The TA2021 has a simple two-pole output filter with excellent performance in listening tests. (See Application Note 4 for additional information on bench testing) Connection IN1 IN2 IN3 AGND IN4 IN5 IN6
3
RB-TA2021 Six Channel - CS/Rev. 1/12.02
Tr i path Technol ogy, I nc. -
Technical Information
Characteristic Curves
THD+N vs Output Power
(VCC=13.5V, 4ohm load)
10 5 2 THD+N (%) 1 0.5 0.2 0.1 0.05 0.02 0.01 1 2 3 4 5 6 7 8 9 10 20
Output Power (W)
Output Frequency Response
(VCC = 13.5V, with a 1W reference output, 4ohm load) +1 +0 -1 -2 Output (dBr) -3 -4 -5 -6 -7 20 50 100 200 500 1k 2k 5k 10k 20k 40k
Frequency (Hz)
Noise Floor
VCC=13.5V, 4 ohm load -80 -85 -90 Output (dB) -95 -100 -105 -110 -115 -120 100 200 500 1k 2k 5k 10k 20k
Frequency (Hz)
4
RB-TA2021 Six Channel - CS/Rev. 1/12.02
Tr i path Technol ogy, I nc. -
Technical Information
Layout Considerations It is critical to have a good printed circuit board layout to prevent potentially damaging voltage stress as well as maximize audio performance. When designing a layout for two or more devices as opposed to a single TA2021, there are additional requirements to be considered. The following are layout recommendations to achieve the best performance and reliability for multiple device designs. The layout recommendations are listed in order of importance. The reference designators are for U1 of the schematic. The same rules apply for components around U1B and U1C. 1. 2. 3. 4. 5. 6. All decoupling capacitors should be as close to each device as possible. This includes C6, C7, C18, C19, C26 and C17. Utilize ground and power planes whenever possible. Separation of analog and digital ground planes will optimize audio performance; they should be joined in one place only to avoid ground loops. D5, D6, D7 and D8 should be located as close to the device as possible. These fast recovery diodes minimize output undershoot during high current events such as shorts to ground. R5 and R6 should be located as close to the device as possible. These are the feedback resistors for the input-inverting amplifiers. Ensure that the ground connection between the BIASCAP capacitor (C26) and the signal ground input is strong. If there is any noise voltage between these two points, the signal to noise ratio will be degraded. R7 should be close to pin 6 (REF) and the ground side should be connected directly to pin 5 (AGND1).
7.
Contact Information
TRIPATH TECHNOLOGY, INC 2560 Orchard Parkway, San Jose, CA 95131 408.750.3000 - P 408.750.3001 - F For more Sales Information, please visit us @ www.tripath.com/cont_s.htm For more Technical Information, please visit us @ www.tripath.com/data.htm
5
RB-TA2021 Six Channel - CS/Rev. 1/12.02
Tr i path Technol ogy, I nc. -
Technical Information
Evaluation Board Schematic
6
RB-TA2021 Six Channel - CS/Rev. 1/12.02
Tr i path Technol ogy, I nc. -
Technical Information
Evaluation Board Bill of Materials
7
RB-TA2021 Six Channel - CS/Rev. 1/12.02
Tr i path Technol ogy, I nc. -
Technical Information
Evaluation Board Layout (Top-Layer Composite)
8
RB-TA2021 Six Channel - CS/Rev. 1/12.02
Tr i path Technol ogy, I nc. -
Technical Information
Evaluation Board Layout (Bottom-Layer Composite)
9
RB-TA2021 Six Channel - CS/Rev. 1/12.02
Tr i path Technol ogy, I nc. -
Technical Information
Evaluation Board Layout (Top-Layer Silkscreen)
10
RB-TA2021 Six Channel - CS/Rev. 1/12.02
Tr i path Technol ogy, I nc. -
Technical Information
Evaluation Board Layout (Bottom-Layer Silkscreen)
11
RB-TA2021 Six Channel - CS/Rev. 1/12.02

▲Up To Search▲

Price & Availability of RB-TA2021

	To Download RB-TA2021 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .