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. 16 pin SOP (Plastic) 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 ∗ 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 AUXIN2 (–30dBm) PBIN2 (–30dBm) PBIN1 (–30dBm) AUXIN1 (–30dBm) P22 P21 P11 C11 1µ C21 1µ 1 16 C2 10µ 2 15 C12 1µ MOA MOA C1 47µ C OFF 5 4 B Mode Control 12 AUX IREF 13 TAPE C23 1µ 6 SSK SSK 11 C14 100n C15 68n LLS LDET 8 HLS HDET 7 LLS LDET HDET HLS 9 10 C24 100n C25 68n P23 P1 P13 LINEOUT2 (–6dBm) VCC LINEOUT1 (–6dBm) 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. C22 1µ 3 14 R1 20k C13 1µ TCL1 P12 AUXIN1 AUXIN2 GND VCC IREF VCT PBIN1 PBIN2 MODE NRSW LINEOUT1 LINEOUT2 TCH1 TCH2 –2– TCL2 Block Diagram, Pin Configuration and Application Circuit CXA2502M CXA2502M Pin Description Pin No. Symbol Z (in) VDC (V) Equivalent circuit Description VCC VCT 1 16 Auxiliary input. Reference level = –30dBm 40k AUX IN 40K VCT GND 2 VCC Positive power supply. VCC VCC VCT 3 14 Playback input. Reference level = –30dBm 40k PB IN 40K VCT GND 4 VCT 0 Dual power supply: Ground Single power supply: Vcc/2 VCT VCC 50µA NR control High: C type Medium:B type Low: NR OFF 22k 5 NRSW — — GND VCC 200 6 11 LINE OUT 0 Line output. VCT 200 GND –3– CXA2502M Pin No. Symbol Z (in) VDC (V) Equivalent circuit Description VCC 7 10 TCH — 13k 0.4V Time constant for the HLS. 36k 330k GND VCC 8 9 TCL — Time constant for the LLS. 13.5k 0.4V 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 Dual power supply: Negative power supply Single power supply: Ground GND –4– CXA2502M Electrical characteristics (Ta = 25°C, VCC = 9V) Symbol Characteristics Measurement conditions∗ P/A Operating voltage Vopr Current consumption ICC LINEOUT level Vlout AUX IN level Vlin PB IN level Vpin PB (1) (2) (3) (4) B-R-1 B-R-2 B-R-3 B-R-4 (1) (2) (3) (4) (5) (6) NR f (Hz) Other conditions No Signal Min. Typ. Max. Unit 7.2 — 16.0 V 8.0 12.0 18.0 mA OFF 1k –7.0 –6.0 –5.0 dBm AUX OFF 1k –32 –30 –28 dBm OFF 1k –32 –30 –28 dBm PB PB PB PB B B B B 500 5k 10k 10k –25dB –25dB –40dB 0dB 1.4 3.9 9.7 –1.1 2.9 5.4 10.4 0.4 4.4 6.9 11.4 1.9 dB dB dB dB C-R-1 C-R-2 C-R-3 C-R-4 C-R-5 C-R-6 PB PB PB PB PB PB C C C C C C 500 500 2k 2k 5k 10k –60dB –25dB –60dB –25dB –25dB 0dB 14.2 7.2 18.7 5.4 3.5 –5.5 16.2 9.2 20.7 7.4 5.5 –3.5 18.2 11.2 22.7 9.4 7.5 –1.5 dB dB dB dB dB dB Vomax PB OFF 1k THD = 1% 13.5 16.0 — dB 1) NR OFF THD (OFF) PB OFF 1k +10dB — 0.01 0.1 % 2) B THD (B) PB B 1k +10dB — 0.03 0.1 % 3) C THD (C) PB C 1k +10dB — 0.04 0.2 % Decode S/N ratio SN (CCIR) PB C — Rg = 5kΩ (CCIR/ARM) 75 83 — dB REC-PB PB-REC ch to ch CT-1 CT-2 CT-3 PB OFF AUX OFF PB OFF 1k 1k 1k 0dB 0dB 0dB — — — –85 –85 –68 –70 –70 –60 dB dB dB Offset voltage (OFF-C type) Voff OFF →C — –100 0 100 mV Decode characteristics B type boost C type boost Signal handling Total harmonic distortion PB ∗ 0dB means the level which provides –6dBm to the line output when NR is off. –5– S22 S21 C21 1µ 2 C22 1µ 3 VCC AUXIN2 1 C1 100µ C2 100µ 4 VNRSW C25 68n C23 1µ 7 6 5 C24 100n AUXIN1 PBIN2 CXA2502M GND VCT Audio SG 9 10 11 12 13 14 C15 68n 15 C14 PBIN1 VMODE 100n IREF 16 R1 20K MODE C12 1µ LINEOUT1 NRSW C11 1µ TCH1 LINEOUT2 –6– TCH2 S11 C13 1µ TCL1 8 TCL2 S12 Electrical Characteristics Measurement Circuit S2_2 S2_1 VCC CCIR/ARM Filter A DC Volt Meter S3 Audio Analyzer 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 VM VL NRSW C type B type NR OFF MODE → TAPE AUX Table 1 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 Decode Mode 15 14 13 NR OFF B type C type 12 11 10 9 4 6 8 10 12 14 Quiescent current consumption vs. Input level ICC – Quiescent current consumption [mA] ICC – Quiescent current consumption [mA] Quiescent current consumption vs. Supply voltage Decode Mode VCC = 9V 15 0dB = –6dBm C f = 10kHz 14 B f = 10kHz 13 NR OFF 12 11 B f = 1kHz C f = 1kHz 10 9 16 –12 –8 VCC – Supply voltage [V] –4 0 4 8 12 Input level [dB] B type decode characteristics C type decode characteristics –2 –4 0 0dB 2 –10dB 4 –20dB 0dB 0 6 –30dB 8 10 –40dB 500 –30dB 12 –40dB –50dB 16 1k 2k 5k VCC = 9V 0dB = Lineout Level –60dB 24 10k 20k 100 200 500 1k 2k 5k Frequency [Hz] Frequency [Hz] Signal handling Load characteristics Decode Mode f = 1kHz THD = 1% 20 0dB = –6dBm NR OFF Maximum output level [dBm] 100 200 –20dB 8 20 VCC = 9V 0dB = Lineout Level 12 Signal handling [dB] 4 Decode boost [dB] Decode boost [dB] –10dB C type 10 10k 20k Decode Mode VCC = 9V 12 THD = 1% f = 1kHz 10 NR OFF 8 6 4 2 0 0 4 6 8 10 12 14 16 100 VCC – Supply voltage [V] 300 1k 3k Frequency [Hz] –8– 10k CXA2502M NR OFF total harmonic distortion-2 NR OFF total harmonic distortion-1 Decode Mode f = 1kHz 0.1 0dB = –6dBm Distortion [%] Distortion [%] Decode Mode VCC = 9V 0.1 0dB = –6dBm f = 10kHz 0.01 VCC = 7V 0.01 f = 100Hz f = 1kHz VCC = 16V 0.001 0.001 –4 0 4 8 12 16 –4 20 0 4 8 12 16 20 Output level [dB] Output level [dB] B type total harmonic distortion-1 B type total harmonic distortion-2 Decode Mode f = 1kHz 0.1 0dB = –6dBm Decode Mode VCC = 9V 0.1 0dB = –6dBm f = 1kHz Distortion [%] Distortion [%] f = 100Hz f = 10kHz 0.01 VCC = 7V 0.01 VCC = 16V 0.001 0.001 –4 0 4 8 12 16 –4 20 0 4 8 12 16 20 Output level [dB] Output level [dB] C type total harmonic distortion-1 C type total harmonic distortion-2 Decode Mode VCC = 9V 1.0 0dB = –6dBm Decode Mode f = 1kHz 1.0 0dB = –6dBm Distortion [%] Distortion [%] f = 10kHz f = 100Hz 0.1 0.1 VCC = 7V VCC = 16V f = 1kHz 0.01 0.01 –4 0 4 8 12 16 20 –4 Output level [dB] 0 4 8 12 Output level [dB] –9– 16 20 CXA2502M Cross talk Cross talk [dB] –30 VCC = 9V Input = +10dB Refer to Dolby Level –40 NR OFF –50 –60 CH to CH –70 –80 AUX to PB, PB to AUX –90 100 300 3k 1k 10k Frequency [Hz] MODE control threshold VCM – MODE control voltage [V] 14 12 10 8 PB 6 4 2 0 AUX 4 6 8 10 12 14 16 VCC – Power supply [V] NR control threshold VCC VCN – NR control voltage [V] 14 12 10 C type VCT 8 6 B type 4 2 0 NR OFF 4 6 8 10 12 14 VCC – Supply voltage [V] – 10 – 16 CXA2502M Unit: mm 16PIN SOP (PLASTIC) + 0.4 1.85 – 0.15 + 0.4 9.9 – 0.1 16 9 6.9 + 0.2 0.1 – 0.05 8 + 0.1 0.2 – 0.05 1.27 0.45 ± 0.1 0.5 ± 0.2 1 7.9 ± 0.4 0.15 + 0.3 5.3 – 0.1 Package Outline 0.24 M PACKAGE STRUCTURE PACKAGE MATERIAL SONY CODE SOP-16P-L01 EIAJ CODE SOP016-P-0300 SOLDER PLATING LEAD MATERIAL COPPER ALLOY PACKAGE MASS 0.2g JEDEC CODE – 11 – EPOXY RESIN LEAD TREATMENT