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Part Number: 75T2091
Description: TDK Semiconductor's 75T2089/2090/2091 are complete Dual-Tone Multifrequency (DTMF) Transceivers that can both generate...
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75T2091
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General Description
75T2091 General Description
TDK Semiconductor's 75T2089/2090/2091 are complete Dual-Tone Multifrequency (DTMF) Transceivers that can both generate and detect all 16 DTMF tone-pairs. These ICs integrate the performance-proven 75T202 DTMF receiver with a DTMF generator circuit.
The DTMF receiver electrical characteristics are identical to the standard 75T202 device characteristics. The DTMF generator provides performance similar to the Mostek MK5380, but with an improved (tighter) output amplitude range specification and with the addition of independent latch and reset controls.
An additional feature of the 75T2090/2091 is "imprecise" call progress detector. The detector detects the presence of signals in the 305-640 Hz band.
The 75T2091 also incorporates an early detect function which is useful in multi-channel radio scanning applications. The only external components necessary for the 75T2089/2090/2091 are a 3.58 MHz "colorburst" crystal with a parallel 1 MW resistor. This provides the time base for digital functions and switched-capacitor filters in the device.No external filtering is required.
75T2091 Maximum Ratings
| PARAMETER | RATING |
| DC Supply Voltage (Vp - Vn) | +7V |
| Voltage at any Pin (Vn = 0) | -0.3 to Vp + 0.3V |
| DIN Voltage | Vp + 0.5 to Vp - 10V |
| Current through any Protection Device | =20mA |
| Operating Temperature Range | -40 to + 85°C |
| Storage Temperature | -65 to 150°C |
75T2091 Features
` DTMF Generator and Receiver on one-chip
` Call progress detection (2090/2091 only)
` Early detect output (2091 only)
` DTMF Receiver exhibits excellent speech immunity
` Analog input range from -32 to -2 dBm (ref 600)
` Three-state outputs (4-bit hexadecimal) from DTMF Receiver
` AC coupled, internally biased analog input
` Latched DTMF Generator inputs
` DTMF output typ. -8 dBm (Low Band) and -5.5 dBm (High Band)
` Easy interface for microprocessor dialing
` Uses inexpensive 3.579545 MHz crystal for reference
` Low-power 5 volt CMOS
` Call progress detection (2090/2091 only)
` Early detect output (2091 only)
` DTMF Receiver exhibits excellent speech immunity
` Analog input range from -32 to -2 dBm (ref 600)
` Three-state outputs (4-bit hexadecimal) from DTMF Receiver
` AC coupled, internally biased analog input
` Latched DTMF Generator inputs
` DTMF output typ. -8 dBm (Low Band) and -5.5 dBm (High Band)
` Easy interface for microprocessor dialing
` Uses inexpensive 3.579545 MHz crystal for reference
` Low-power 5 volt CMOS
75T2091 Connection Diagram
75T2091
PDF/DataSheet Download
- Datasheet: 75T2091
- File Size: 77408 KB
- Manufacturer: TDK [TDK Electronics]
- Click here to Download
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75T2091 Relative Products
75T2090
TDK Semiconductor's 75T2090 are complete Dual-Tone Multifrequency (DTMF) Transceivers that can both generate and detect all 16 DTMF tone-pairs. These ICs integrate the performance-proven 75T202 DTMF receiver with a DTMF generator circuit. The DTMF receiver e...
75T2089
TDK Semiconductor's 75T2089 are complete Dual-Tone Multifrequency (DTMF) Transceivers that can both generate and detect all 16 DTMF tone-pairs. These ICs integrate the performance-proven 75T202 DTMF receiver with a DTMF generator circuit. The DTMF receiver e...
75T204
The 75T204 is a complete Dual-Tone Multifrequency (DTMF) receiver that detects 16 standard digits. No front-end pre-filtering is needed. The only external components required are an inexpensive 3.58-MHz television "colorburst" crystal for frequency referenc...
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