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CS5451A 데이터시트(PDF) 3 Page - Cirrus Logic |
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CS5451A 데이터시트(HTML) 3 Page - Cirrus Logic |
3 / 14 page CS5451A DS635F3 3 1. PIN DESCRIPTION Clock Generator Master Clock Input 25 XIN - External clock signal or oscillator input. Control Pins and Serial Data I/O Serial Clock Output 1 SCLK - Serial port clock signal that determines the output data rate for SDO pin. Rate of SCLK is dependent on the XIN frequency and state of OWRS pin. Serial Data Output 2 SDO -Serial port data output pin. Data will be output at a rate defined by SCLK. Frame Sync 3 FSO - Framing signal indicates when data samples are about to be transmitted on the SDO pin. Serial Port Enable 4 SE - When SE is low, the output pins of the serial port are tri-stated. Current Input Gain 5 GAIN - A logic high sets current channel gain to 1, a logic low sets the gain to 20. If no connection is made to this pin, it will default to logic low level (through internal 200 k Ω resistor to DGND). Output Word Rate Select 23 OWRS - A logic low sets the output word rate (OWR) to XIN/2048 (Hz). A logic high sets the OWR to XIN/1024 (Hz). If no connection is made to this pin, then OWRS will default to logic low level (through internal 200 k Ω resistor to DGND). Reset 24 RESET - Low activates Reset, all internal registers are set to their default states. Analog Inputs/Outputs Voltage Reference Input 7 VREFIN - The input to this pin establishes the voltage reference for the on-chip modulator. Voltage Reference Output 8 VREFOUT - The on-chip voltage reference output. The voltage reference has a nominal magni- tude of 1.2 V and is referenced to the AGND pin on the converter. Differential Voltage Inputs 11,12 18,17 22,21 VIN3+, VIN3- - Differential analog input pins for the voltage channel 3. VIN2+, VIN2- - Differential analog input pins for the voltage channel 2. VIN1+, VIN1- - Differential analog input pins for the voltage channel 1. Differential Current Inputs 13,14 16,15 20,19 IIN3+, IIN3- - Differential analog input pins for the current channel 3. IIN2+, IIN2- - Differential analog input pins for the current channel 2. IIN1+, IIN1- - Differential analog input pins for the current channel 1. Power Supply Connections Analog Ground 6 AGND - Analog ground. Positive Analog Supply 9 VA+ - The positive analog supply. Typical +3 V ±10% relative to AGND. Negative Analog Supply 10 VA- - The negative analog supply. Typical -2 V ±10% relative to AGND. Charge Pump Drive 26 CPD - Designed to drive external charge pump circuitry that will produce a negative analog sup- ply (VA-)voltage. Digital Ground 27 DGND - Digital Ground. Positive Digital Supply 28 VD+ - The positive digital supply. Typical +3 V ±10% relative to AGND. 1 14 7 13 6 12 5 11 9 4 3 8 10 2 15 18 16 24 20 19 25 21 17 26 27 22 28 23 IIN2- VIN2+ IIN2+ RESET IIN1+ IIN1- XIN VIN1- VIN2- CPD DGND VIN1+ VD+ OWRS IIN3- VIN3+ IIN3+ GAIN VA+ VA - SE VREFOUT VIN3- FSO SDO VREFIN SCLK AGND Differential Current Input 2 Differential Voltage Input 2 Differential Current Input 2 Reset Differential Current Input 1 Differential Current Input 1 Master Clock Differential Voltage Input 1 Differential Voltage Input 2 Charge Pump Drive Digital Ground Differential Voltage Input 1 Digital Supply Output Word Rate Select Differential Current Input 3 Differential Voltage Input 3 Differential Current Input 3 Current Input Gain Positive Analog Supply Negative Analog Supply Serial Port Enable Reference Output Differential Voltage Input 3 Frame Sync Serial Data Output Reference Input Serial Clock Output Analog Ground |
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