SM6800AB

SM6800A Class-D Mono Amplifier for Mobile Telephones OVERVIEW The SM6800A is an analog-input, class-D mono amplifier. Class-D operation provides high efficiency and low power consumption. The device also incorporates a selectable real-time operation dynamic range compression function that effectively suppresses the distortion in the saturation level region output by soft-clipping, boosting the average sound pressure from the speaker during playback. It also incorporates an input equalizer pin for output speaker frequency characteristics adjustment. These features make the device ideal for use in mobile telephones and speaker applications requiring miniaturization and high-efficiency. The output stage has a BTL output configuration where the output waveform inverts only the modulation components, enabling direct drive connection, without using an LC filter, to a dynamic speaker. The device is available in miniature 20-pin QFN packages, and requires only a peripheral chip capacitor to form a miniature amplifier circuit. FEATURES I I I I I PINOUT (Top view) PROT TEST TM2 TM1 VSS3 20 19 18 17 16 I I APPLICATIONS I I I Cellular phone PDA Digital still camera PACKAGE DIMENSIONS (Unit: mm) 4.20 ± 0.20 4.00 ± 0.10 ORDERING INFORMATION Device SM6800AB Package 4.20 ± 0.20 20-pin QFN 4.00 ± 0.10 20 1 0.50 VREF3 VREF2 VREF1 PDWN MUTEN Operating supply voltage: 2.7 to 4.3V Low current consumption: 4.8mA (VDD = 3.6V) Output power: 0.7W (VDD = 3.6V, 8Ω load) Output fundamental frequency: 125kHz Gain • 4.5dB (Normal) • 12dB to 4.5dB automatic adjustment in response to the input level (Dynamic range compression mode) Silicon-gate CMOS process Package: 20-pin QFN VDD1 IN EQP EQN VSS1 1 2 3 4 5 6 7 8 9 10 15 14 13 12 11 VDD3 OUTP VSS2 OUTN VDD2 0.60 ± 0.10 0.05 0.22 ± 0.05 0.05 M 1.00MAX NIPPON PRECISION CIRCUITS INC.—1 + 0.03 0.02 − 0.02 0.22 SM6800A BLOCK DIAGRAM EQP EQN VDD1 VSS1 TM1 TM2 TEST VSS3 VDD2 IN − + VSS2 LEVEL SHIFTER PWM Modulator − + BUFFER OUTP VREF1 VREF2 LEVEL SHIFTER BUFFER OUTN VREF1 VREF2 BIAS, VREF1, VREF2, VREF3 VREF3 MUTE, POWERDOWN, PROTECTION VDD3 OSC VREF1 VREF2 VREF3 MUTEN PDWN PIN DESCRIPTION Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name1 VDD1 IN EQP EQN VSS1 VREF3 VREF2 VREF1 PDWN MUTEN VDD2 OUTN VSS2 OUTP VDD3 VSS3 TM1 TM2 TEST PROT I/O2 – I I I – – – – I I – O – O – – I I Ip O Supply (input system) Signal input Equalizer network connection Equalizer network connection Ground (input system) Reference voltage 3 (internal bias voltage monitor. No connection for normal operation) Reference voltage 2 (internal bias voltage monitor. No connection for normal operation) Reference voltage 1 (bias voltage) Power-down control (active LOW) Mute control (active LOW) Supply (OUTN stage) Speaker minus (–) output Ground (OUTP and OUTN stages) Speaker plus (+) output Supply (OUTP stage) Ground (output system) Dynamic range compression mode setting 1 Dynamic range compression mode setting 2 Test pin (HIGH: normal operation, LOW: test mode) Protection circuit output (HIGH: protection circuit operation, LOW: normal operation) Function 1. VDDS = VDD1, VDDP = VDD2 = VDD3, VSS = VSS1 = VSS2 = VSS3 2. Ip = input pin with built-in pull-up resistor NIPPON PRECISION CIRCUITS INC.—2 SM6800A SPECIFICATIONS Absolute Maximum Ratings Parameter Supply voltage range Supply voltage ground Input voltage range Storage temperature range Output current Power dissipation1 Symbol VDDS, VDDP VSS VIN TSTG IO PD Rating −0.3 to 4.6 0 VSS − 0.3 to VDDS + 0.3 −55 to +125 300 340 Unit V V V °C mA mW 1. Under NPC measurement conditions, θJa = 116.2°C/W. The power dissipation is given by: PD = ((TJMAX − Ta)/ θJa) where TJMAX = 125°C and Ta = 85°C Recommended Operating Conditions VSS = VSS1 = VSS2 = VSS3 = 0V, VDDS =VDD1, VDDP = VDD2 = VDD3 unless otherwise noted Parameter Supply voltage 1 Supply voltage 2 Supply voltage difference Operating temperature range Symbol VDDS VDDP VDD3 − VDD2 Ta Rating 2.7 to 4.3 2.7 to 4.3 Unit V V V °C ± 0.1 −40 to 85 Electrical Characteristics DC Characteristics VSS1 = VSS2 = VSS3 = 0V, VDD1 = 2.7 to 4.3V, VDD2 = VDD3 = 2.7 to 4.3V, Ta = −40 to 85°C unless otherwise noted Rating Parameter Pin Symbol IDD1A IDD1S VDD2 + VDD3 Input voltage 1 Input voltage 2 Input leakage current 1 Input leakage current 2 TEST TM1, TM2, MUTEN, PDWN TEST TM1, TM2, MUTEN, PDWN IDDAA IDDAS VIH1 VIH2 VIL2 ILH1 ILH2 ILL2 (Note 1) (Note 2) (Note 1) (Note 2) HIGH level HIGH level LOW level VIN = VDD1 VIN = VDD1 VIN = 0V Conditions min – – – – 0.8VDDS 0.9VDDS – − − − VDD1 Current consumption typ 4.6 0.2 0.2 0.1 – – – – – − max 8.0 0.5 0.6 0.3 – – 0.4 1.0 1.0 1.0 mA µA mA µA V V V µA µA µA Unit Note 1: MUTEN = HIGH, PDWN = HIGH, input and VREF1 connected by 600Ω, TM1 = TM2 = LOW, no-load output Note 2: MUTEN = LOW, PDWN = LOW, input and VREF1 connected by 600Ω, TM1 = TM2 = LOW, no-load output NIPPON PRECISION CIRCUITS INC.—3 SM6800A AC Analog Characteristics VDD1 = VDD2 = VDD3 = 3.6V, VSS1 = VSS2 = VSS3 = 0V, 0.708Vrms analog input amplitude, 1kHz input signal frequency, Ta = 25°C, "Measurement block diagram”, "Measurement conditions”, "Measurement circuit”, TM1 = TM2 = LOW, PDWN = MUTEN = HIGH, unless otherwise noted Analog input characteristics (IN) Rating Parameter Reference input amplitude 1 Reference input amplitude 2 Input resistance Input clipping voltage Symbol VAI1 VAI2 RIN VCLP PO PO PO Conditions min typ 0.708 0.178 60 1 max – – 72 1.3 Vrms Vrms kΩ Vrms Unit – – 48 = 0.2W = 0.05W = 0.5W 0.7 Analog output characteristics (OUTP, OUTN) Rating Parameter Symbol Conditions min Voltage gain 1 Voltage gain 2 Residual noise voltage Total harmonic distortion + noise Maximum output power Mute-mode output voltage HIGH-level output voltage LOW-level output voltage Efficiency A1 A2 VNS THD + N POMAX VMUTE VOH VOL EEF Maximum output power conditions TM1 = TM2 = LOW, reference input amplitude 1 TM1 = HIGH, TM2 = LOW, reference input amplitude 2 TM1 = TM2 = LOW, input and VREF1 connected by 600Ω PO = 0.2W, reference input amplitude 1 Output power when THD = 10% Output power when MUTEN = LOW 2.5 10.0 – – 0.6 – 90.0 VDDP – 0.1 0 80 typ 4.5 12.0 68 0.4 0.7 – 110 VDDP – 0.02 0.02 83 max 6.5 14.0 90 1.0 0.8 – VDDP 0.1 – dB dB µVrms % W dBV V V % Unit Reference voltage characteristics (VREF1) Rating Parameter Reference output voltage 1 Symbol min VREF1 0.45VDDS typ 0.5VDDS max 0.55VDDS V Unit NIPPON PRECISION CIRCUITS INC.—4 SM6800A Measurement block diagram 40µH SPOUT POS 1µF BALANCED INPUT + EVALUATION BOARD 40µH SPOUT NEG 1µF 8Ω AUDIO ANALYZER BALANCED INPUT − Measurement conditions Parameter Audio Analyzer (Audio Precision System Two Cascade) Built-in Filters Low-pass filter (20kHz) ON High-pass filter (22Hz) ON Low-pass filter (20kHz) ON High-pass filter (22Hz) ON A-weighted Excluding residual noise Residual noise voltage NIPPON PRECISION CIRCUITS INC.—5 SM6800A Measurement circuit TEST PROT (H NORMAL) SW3 H L SW4 TM2 SW5 H L TM1 H L PROT TEST VDD1 IN SIGNAL INPUT C1 1µ VDD1 IN C3 150p C4 1µ EQP EQN VSS1 POWER VDD (2.7 to 4.3V) VSS3 TM2 TM1 SIGNAL VDD (2.7 to 4.3V) VDD3 OUTP POWER VDD R7* C8 0 (JUMPER) 1µ EQP SPOUT POS POWER VSS (0V) VSS2 R8* OUTN POWER VDD (2.7 to 4.3V) 0 (JUMPER) EQN SIGNAL VSS (0V) C9 C5 1µ SW1* H L MUTEN VREF3 VREF2 VREF1 VSS1 1µ SPOUT NEG PDWN VDD2 SW2* H L ANALOG VSS (0V) Note. *C2, C6, C7: not inserted *R1, R2, R3: not inserted *R7, R8: series resistors for dielectric speaker *SW1: HIGH = Power on, LOW = Power off *SW2: LOW = Mute on, HIGH = Mute off D-Range CP MODE TM1 OFF 1 2 3 L H L H TM2 L L H H NIPPON PRECISION CIRCUITS INC.—6 SM6800A FUNCTIONAL DESCRIPTION Power-down (PDWN) The device enters power-down mode when PDWN goes LOW. When powered-down, the outputs become high impedance and the internal oscillation stops. In power-down mode, the MUTEN pin should be held LOW. Mute (MUTEN) Mute operation occurs when MUTEN goes LOW. In mute mode, the outputs become high impedance. During mute operation, the protection circuit operation is disabled, but the outputs are protected against output short circuits by their high impedance state. When power is applied, MUTEN should be held LOW for a short interval, shown in the timing diagram below, to prevent pop noise from the speaker. Also, applying and releasing mute operation after power is applied can occur at high speed without generating pop noise. min. 40msec PDWN MUTEN Note. VREF1 load capacitance = 1µF Protection Circuit The protection circuit operates if there is an output short-circuit to the supply, short-circuit to ground, or other excessive load abnormal condition lasting longer than approximately 1µs. Normal operation resumes after approximately 5 seconds. When the protection circuit becomes active, the PROT output goes HIGH and the outputs become high impedance. NIPPON PRECISION CIRCUITS INC.—7 SM6800A Input Equalizer (IN, EQP, EQN) An input equalizer network can be connected to pins IN, EQP, and EQN, as shown in the input equivalent circuit and equalizer circuit below. R01 R02 C02 R04 R03 C03 C04 EQP 3 EQN 4 60k C01 IN' 60k 2 IN VREF1 − + The frequency response of the equalizer circuit is given by the following equation, where ƒ is the frequency. 1 1 + 60000 Response = 20 × log10 1 + 2πƒC01 1 R03 + 1 2πƒC03 + 1 + 2πƒC04 R04 [dB] 1 1 1 + + 60000 R01 1 R02 + 1 2πƒC02 Dynamic Range Compression Mode (TM1, TM2) The dynamic range compression mode is selected by the state of the TM1 and TM2 inputs. When a compression mode is used, the gain for small input signals is increased while large input signals are converted using a curve that performs soft-clipping. This increases the average sound pressure level emitted from the speaker during playback. Dynamic range compression mode OFF 1 2 3 TM1 L H L H TM2 L L H H Effect No effect Small effect Medium effect Large effect NIPPON PRECISION CIRCUITS INC.—8 SM6800A TYPICAL APPLICATION CIRCUITS Dynamic Speaker LC-type LPF connection 47µF OUTPUT 2 SPOUT POS 14 1µF SOUND GENERATOR IC SM6800 47µF SPOUT NEG 12 1µF Direct connection OUTPUT 2 SPOUT POS 14 SOUND GENERATOR IC SM6800 SPOUT NEG 12 Dielectric Speaker A dielectric speaker is capacitive in nature, and therefore requires output resistor connection. OUTPUT 2 SPOUT POS 14 4Ω SOUND GENERATOR IC * SM6800 4Ω SPOUT NEG 12 * Dielectric speaker Taiyo Yuden MLS20070, MLS23070, MLS25070 or similar NIPPON PRECISION CIRCUITS INC.—9 SM6800A TYPICAL CHARACTERISTICS Measurement conditions: Refer to “Analog output characteristics”. Measurement circuit: Refer to “Measurement circuit”. 100 50 20 10 5 10 5 2 1 500m Output power [W] THD + N [%] 2 1 0.5 0.2 0.1 0.05 0.02 0.01 -25 THD + N Output power 200m 100m 50m 20m 10m 5m 2m 1m -22.5 -20 -17.5 -15 -12.5 -10 -7.5 -5 -2.5 +0 +2.5 +5 Input [dBV] Input vs. THD + N and Output power (VDD = 3.6V) +10 +7.5 +5 +2.5 D-RANGE-CP3 D-RANGE-CP2 Output [dBV] +0 -2.5 -5 -7.5 -10 -12.5 -15 -17.5 -20 -20 -18 -16 -14 -12 -10 -8 -6 -4 -2 -0 +2 +4 Normal mode D-RANGE-CP1 Input [dBV] Input vs. Output (VDD = 3.6V) NIPPON PRECISION CIRCUITS INC.—10 SM6800A -70 -75 -80 -85 Residual noise [dBV] -90 -95 -100 -105 -110 -115 -120 -125 -130 -135 -140 20 50 100 200 500 1k 2k 5k 10k 20k Frequency [Hz] Residual noise vs. Frequency (VDD = 3.6V) 10 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 20 50 100 200 500 1k 2k THD + N +6 +5 +4 +3 +2 +1 -0 -1 -2 -3 -4 -5 -6 Output voltage [dBr] THD + N [%] Output voltage 5k 10k 20k Frequency [Hz] THD + N and Output voltage vs. Frequency (VDD = 3.6V) NIPPON PRECISION CIRCUITS INC.—11 SM6800A Please pay your attention to the following points at time of using the products shown in this document. The products shown in this document (hereinafter “Products”) are not intended to be used for the apparatus that exerts harmful influence on human lives due to the defects, failure or malfunction of the Products. Customers are requested to obtain prior written agreement for such use from NIPPON PRECISION CIRCUITS INC. (hereinafter “NPC”). Customers shall be solely responsible for, and indemnify and hold NPC free and harmless from, any and all claims, damages, losses, expenses or lawsuits, due to such use without such agreement. NPC reserves the right to change the specifications of the Products in order to improve the characteristic or reliability thereof. NPC makes no claim or warranty that the contents described in this document dose not infringe any intellectual property right or other similar right owned by third parties. Therefore, NPC shall not be responsible for such problems, even if the use is in accordance with the descriptions provided in this document. Any descriptions including applications, circuits, and the parameters of the Products in this document are for reference to use the Products, and shall not be guaranteed free from defect, inapplicability to the design for the mass-production products without further testing or modification. Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested appropriately take steps to obtain required permissions or approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome, Koto-ku, Tokyo 135-8430, Japan Telephone: +81-3-3642-6661 Facsimile: +81-3-3642-6698 http://www.npc.co.jp/ Email: sales@npc.co.jp NC0316AE 2004.09 NIPPON PRECISION CIRCUITS INC.—12