CXA2502M

CXA2502M Dolby∗ B-C Type Noise Reduction System for Playback Description The CXA2502M is a bipolar IC incorporating stereo Dolby B-C type noise reduction (NR) system for playback. Pins of this IC are compatible with those of the Dolby B type NR ICs CXA1102M/ CXA1552M. A reduction in the number of external parts and small package have been achieved due to the fact that the spectral skewing circuits are all on-chip and this IC is intended for playback. Features • Few external parts • Spectral skewing circuit are on-chip • NR OFF/B/C and AUX/TAPE switches • Small package (16-pin SOP) • Low current consumption 12mA Typ. • Built-in two channels Structure Bipolar silicon monolithic IC Absolute Maximum Ratings (Ta = 25°C) • Supply voltage VCC 17 V • Operating temperature Topr –40 to +85 °C • Storage temperature Tstg –65 to +150 °C • Allowable power dissipation PD 600 (SOP) mW 16 pin SOP (Plastic) ∗ This IC is available only to the licensees of Dolby Laboratories Licensing Corporation from whom licensing and applications information may be obtained. ∗ “Dolby” and the double D symbols are trademarks of Dolby Laboratories Licensing Corporation. Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits. –1– E95621A5X-PS Block Diagram, Pin Configuration and Application Circuit P12 C13 1µ P13 LINEOUT1 (–6dBm) PBIN1 (–30dBm) AUXIN1 (–30dBm) P11 PBIN1 LINEOUT1 C11 1µ C12 1µ R1 20k TAPE AUX C14 100n C15 68n AUXIN1 IREF TCH1 GND 16 11 15 10 14 13 12 9 MODE HDET MOA SSK HLS TCL1 LDET LLS P1 VCC LLS LDET 7 8 C25 68n VCC VCT PBIN2 AUXIN2 NRSW C21 1µ C2 10µ C22 1µ C1 47µ C B OFF LINEOUT2 C24 100n C23 1µ P21 AUXIN2 (–30dBm) PBIN2 (–30dBm) P22 TCH2 TCL2 –2– IREF SSK MOA HLS HDET 2 3 4 5 6 Mode Control 1 P23 LINEOUT2 (–6dBm) CXA2502M Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same. CXA2502M Pin Description Pin No. Symbol Z (in) VDC (V) Equivalent circuit VCC Description VCT 1 16 40k AUX IN 40K VCT Auxiliary input. Reference level = –30dBm GND 2 VCC VCC VCC Positive power supply. VCT 3 14 40k PB IN 40K VCT Playback input. Reference level = –30dBm GND 4 VCT 0 VCT Dual power supply: Ground Single power supply: Vcc/2 VCC 50µA 22k 5 NRSW — — NR control High: C type Medium:B type Low: NR OFF GND VCC 200 6 11 LINE OUT 0 VCT 200 Line output. GND –3– CXA2502M Pin No. Symbol Z (in) VDC (V) Equivalent circuit VCC Description 7 10 TCH — 0.4V 13k 36k Time constant for the HLS. 330k GND VCC 8 9 TCL — 0.4V 13.5k Time constant for the LLS. 480k GND VCC 50µA 22k 12 MODE — — MODE control High: TAPE Low: AUX GND VCC 13 IREF 0 1.25V 1.25V Reference current which determines the built-in filter cut-off frequency. GND 15 GND GND Dual power supply: Negative power supply Single power supply: Ground –4– CXA2502M Electrical characteristics Characteristics Operating voltage Current consumption LINEOUT level AUX IN level PB IN level Decode characteristics B type boost (1) (2) (3) (4) C type boost (1) (2) (3) (4) (5) (6) Signal handling Total harmonic distortion 1) NR OFF 2) B 3) C Decode S/N ratio REC-PB PB-REC ch to ch Offset voltage (OFF-C type) THD (OFF) THD (B) THD (C) SN (CCIR) CT-1 CT-2 CT-3 Voff PB PB PB PB OFF B C C 1k 1k 1k — 1k 1k 1k — +10dB +10dB +10dB Rg = 5kΩ (CCIR/ARM) 0dB 0dB 0dB — — — 75 — — — –100 C-R-1 C-R-2 C-R-3 C-R-4 C-R-5 C-R-6 Vomax PB PB PB PB PB PB PB C C C C C C OFF 500 500 2k 2k 5k 10k 1k –60dB –25dB –60dB –25dB –25dB 0dB THD = 1% 14.2 7.2 18.7 5.4 3.5 –5.5 13.5 B-R-1 B-R-2 B-R-3 B-R-4 PB PB PB PB B B B B 500 5k 10k 10k –25dB –25dB –40dB 0dB 1.4 3.9 9.7 –1.1 Symbol Vopr ICC Vlout Vlin Vpin OFF AUX OFF PB OFF 1k 1k 1k No Signal Measurement conditions∗ P/A NR f (Hz) Other conditions Min. 7.2 8.0 –7.0 –32 –32 (Ta = 25°C, VCC = 9V) Typ. — 12.0 –6.0 –30 –30 Max. 16.0 18.0 –5.0 –28 –28 Unit V mA dBm dBm dBm 2.9 5.4 10.4 0.4 16.2 9.2 20.7 7.4 5.5 –3.5 16.0 4.4 6.9 11.4 1.9 18.2 11.2 22.7 9.4 7.5 –1.5 — dB dB dB dB dB dB dB dB dB dB dB 0.01 0.03 0.04 83 –85 –85 –68 0 0.1 0.1 0.2 — –70 –70 –60 100 % % % dB dB dB dB mV PB OFF AUX OFF PB OFF PB OFF →C ∗ 0dB means the level which provides –6dBm to the line output when NR is off. –5– Electrical Characteristics Measurement Circuit S12 S2_1 DC Volt Meter C12 1µ VMODE 100n C13 1µ S11 R1 20K 13 12 11 10 9 C14 C15 68n C11 1µ 15 14 16 GND IREF PBIN1 AUXIN1 MODE LINEOUT1 TCH1 TCL1 AUXIN2 PBIN2 LINEOUT2 NRSW VCC VCT 1 3 C22 1µ VNRSW 2 4 7 C24 100n C25 68n 8 C2 100µ 5 6 C21 1µ C1 100µ S21 TCH2 TCL2 –6– CXA2502M S2_2 C23 1µ VCC Audio SG A CCIR/ARM Filter S3 Audio Analyzer S22 CXA2502M CXA2502M Application Note The CXA2502M is a stereo Dolby B-C type NR IC like the CXA1560 series. Few external parts and smaller package can be achieved because this IC has a built-in spectral skewing circuit and the reduced number of pins for playback. 1) Power Supply The CXA2502M is designed to operate on either single or dual power supply. For dual power supply, connect VCT pin to GND, and GND pin to the negative power supply. For single power supply, connect GND pin to GND. VCC/2, generated from the internal circuit, is output to VCT pin. Connect a by-pass capacitor between this pin and GND. The operating voltage range is 7.0 to 16V, which satisfies the signal handling of 12dB specified by the Dolby Laboratories. 2) Operation Mode Control The CXA2502M has built-in electronic switches. The operations are controlled by the DC voltages of NRSW and MODE control pins. Table 1 shows the switching truth tables. For single power supply, VH, VM and VL correspond to VCC, VCC/2 and GND, respectivery. For dual power supply, VH, VM and VL correspond to VCC, GND and VEE, respectively. Refer to "threshold" on the characteristics graph for the thresholds of the control voltages. NRSW and MODE control pins are connected to VCT via a 50kΩ resistor, so when the pin is open, VM condition results. VH NRSW MODE C type → VM B type TAPE Table 1 VL NR OFF AUX 3) Reference level The CXA2502M Dolby level is –6dBm (388mVrms). The reference level of the playback input pin (PB IN) is defined as the levels which provide the line output level to the line output pin (LINE OUT) in NR OFF mode. –7– CXA2502M Example of Representative Characteristics Quiescent current consumption vs. Supply voltage ICC – Quiescent current consumption [mA] ICC – Quiescent current consumption [mA] Decode Mode 15 14 13 12 11 10 9 4 6 8 10 12 14 16 NR OFF B type C type Quiescent current consumption vs. Input level Decode Mode VCC = 9V 15 0dB = –6dBm 14 B f = 10kHz 13 NR OFF 12 11 10 9 –12 –8 –4 0 4 8 12 B f = 1kHz C f = 1kHz C f = 10kHz VCC – Supply voltage [V] Input level [dB] B type decode characteristics –2 0 2 0dB –10dB –4 0 C type decode characteristics 0dB –10dB 4 Decode boost [dB] Decode boost [dB] –20dB 8 12 16 20 –30dB –40dB –50dB VCC = 9V 0dB = Lineout Level 100 200 500 1k 2k –60dB 4 6 8 10 12 100 200 500 1k 2k 5k –20dB –30dB VCC = 9V 0dB = Lineout Level –40dB 10k 20k 24 5k 10k 20k Frequency [Hz] Frequency [Hz] Signal handling Decode Mode f = 1kHz THD = 1% 20 0dB = –6dBm Load characteristics Decode Mode VCC = 9V 12 THD = 1% f = 1kHz 10 NR OFF 8 6 4 2 0 C type 10 0 4 6 8 10 12 14 16 Maximum output level [dBm] NR OFF Signal handling [dB] 100 300 1k 3k 10k VCC – Supply voltage [V] Frequency [Hz] –8– CXA2502M NR OFF total harmonic distortion-1 Decode Mode VCC = 9V 0.1 0dB = –6dBm NR OFF total harmonic distortion-2 Decode Mode f = 1kHz 0.1 0dB = –6dBm Distortion [%] Distortion [%] 0.01 f = 10kHz 0.01 VCC = 7V f = 100Hz f = 1kHz VCC = 16V 0.001 –4 0 4 8 12 16 20 Output level [dB] 0.001 –4 0 4 8 12 16 20 Output level [dB] B type total harmonic distortion-1 Decode Mode VCC = 9V 0.1 0dB = –6dBm f = 100Hz B type total harmonic distortion-2 Decode Mode f = 1kHz 0.1 0dB = –6dBm Distortion [%] Distortion [%] f = 1kHz f = 10kHz 0.01 VCC = 7V 0.01 VCC = 16V 0.001 –4 0 4 8 12 16 20 Output level [dB] 0.001 –4 0 4 8 12 16 20 Output level [dB] C type total harmonic distortion-1 Decode Mode VCC = 9V 1.0 0dB = –6dBm f = 10kHz C type total harmonic distortion-2 Decode Mode f = 1kHz 1.0 0dB = –6dBm Distortion [%] 0.1 f = 100Hz Distortion [%] 0.1 VCC = 7V VCC = 16V f = 1kHz 0.01 –4 0 4 8 12 16 20 Output level [dB] 0.01 –4 0 4 8 12 16 20 Output level [dB] –9– CXA2502M Cross talk –30 VCC = 9V Input = +10dB Refer to Dolby Level –40 NR OFF Cross talk [dB] –50 –60 –70 –80 –90 AUX to PB, PB to AUX CH to CH 100 300 1k 3k 10k Frequency [Hz] MODE control threshold 14 VCM – MODE control voltage [V] 12 10 8 PB 6 4 2 0 AUX 4 6 8 10 12 14 16 VCC – Power supply [V] NR control threshold 14 VCC VCN – NR control voltage [V] 12 10 C type 8 6 B type 4 2 0 VCT NR OFF 4 6 8 10 12 14 16 VCC – Supply voltage [V] – 10 – CXA2502M Package Outline Unit: mm 16PIN SOP (PLASTIC) + 0.4 9.9 – 0.1 + 0.4 1.85 – 0.15 16 9 0.15 + 0.2 0.1 – 0.05 + 0.3 5.3 – 0.1 7.9 ± 0.4 0.45 ± 0.1 1.27 + 0.1 0.2 – 0.05 0.24 M PACKAGE STRUCTURE PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE PACKAGE MASS SOP-16P-L01 SOP016-P-0300 LEAD MATERIAL COPPER ALLOY 0.2g LEAD TREATMENT EPOXY RESIN SOLDER PLATING – 11 – 0.5 ± 0.2 1 8 6.9