SM7153 SamHop Microelectronics Corp., SM7153 Datasheet
SM7153
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SM7153 Summary of contents
Page 1
... BITS 6 BITS BI-DIRECTIONAL BI-DIRECTIONAL CK CK SHIFT REGISTER SHIFT REGISTER VDD CK CK A-SW A-SW A-SW A-SW A- A-SW A-SW A-SW A-SW A-SW A-SW Page 1 SM7153 ELECTRONIC VOLUME CONTROLLER SM7153 AUTO INITIALISE CIRCUIT INT CONSTANT CURRENT 8 DCO CIRCUIT 15 R-OUT1 A-SW R-IN1 14 A-SW A-SW A-SW A-SW A-SW A-SW 13 A-GND A-SW 12 R-IN2 A-SW A-SW A-SW A-SW A-SW 11 R-OUT2 ...
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... A signal applied attenuated in 5 steps from 0dB to 8dB at 2 dB/step. Inhibit terminal. INH When this terminal level, all input/ output cut off and the SM7153 is placed in the inhibit state. When level, the SM7153 operates normally. DCO DC current output for displaying attenuation. ...
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... DOWN key is pressed, and the oscillator is actuated in the down state and therefore, attenuation is decreased. Oscillation frequency is decided by Cx and Rx. Figure 1 1 fosc ≒ 0 VDD RS CX OSC RX U DWOM RX= CX=4.7 F 2.2uF RS=100 K VSS Figure 2 Page 3 SM7153 ELECTRONIC VOLUME CONTROLLER (Hz) (Rs ≧ 3Rx) osc V.1.0 ...
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... S H Microelectronics Corp (2) Attenuation Display Output The SM7153 is provided with the DC current output terminal for displaying attenuation. With 0dB ~ ∞ divided into 13 steps, current of approx. 100 A/step is transmitted. Step ...
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... If there is the possibility for excessive voltage being to the attenuator recommended to insert a protective diode as illustrated below V DD Vss BUFFER 0dB AMP OUT 1 -10 -20 -30 -40 -50 -60 ATTENUATOR 1 =50k (Typ.) 1 =20k (Typ.) 2 Figure 4 . Figure 5 Page 5 SM7153 ELECTRONIC VOLUME CONTROLLER 0 OUT ATTENUATOR Vss 2 V.1.0 ...
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... S H Microelectronics Corp (4) Power Supply (a) Dual Power Supply V DD A-GND Vss (b) Single Power Supply V DD A-GND Vss U/D OSC INH DCO UP DOWN DC VDD Figure 6 U/D OSC INH DCO VDD Figure 7 Page 6 SM7153 ELECTRONIC VOLUME CONTROLLER +V DD OSC U/D OV -Vss + OV(Vss) V.1.0 ...
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... When VDD-VSS drops below 4V, the auto-initialising function is actuated. The initialising level is -40dB. If rise of power supply recommended to rise supply voltage and the INH terminal as illustrated below. VDD - VSS OR INH TERMINAL VOLTAGE ELECTRONIC VOLUME Figure 8 T ≧ 1 msec T Figure 9 Page 7 SM7153 CONTROLLER 51K * VDD - VSS = 4.0V V.1.0 ...
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... Symbol Test Condition V DD IDD VDD=4V,INH=L IB INH, VIH U/D Terminal VIL R-IN1 -A-GND RATT-1 (L-IN1) R-IN2 -A-GND RATT-2 (L-IN2) - Biase 0V Vin fck Tck Page 8 SM7153 ELECTRONIC VOLUME CONTROLLER Ratings Unit 15 150 mW -20 ~ +75 -40 ~ +125 Min. Typ. Max 300 VDD+0.3 ...
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... F + INPUT GND 1 F OUTPUT 10K 120KΩ SM7153 Page 9 SM7153 ELECTRONIC VOLUME CONTROLLER TA75558P 27pF 1 F Ω 470K Ω 82K CX RS 1N4148 RX 1N4148 UP DOWN V.1.0 ...