MT88L85 Integrated DTMFTransceiver Datasheet

MT88L85 Datasheet, PDF, Equivalent


Part Number

MT88L85

Description

3V Integrated DTMFTransceiver

Manufacture

Zarlink Semiconductor

Total Page 24 Pages
Datasheet
Download MT88L85 Datasheet


MT88L85
MT88L85
3V Integrated DTMF Transceiver with
Power-Down and Adaptive Micro Interface
Features
DS5032
ISSUE 3
January 1999
Ordering Information
• Complete DTMF transmitter/receiver
• Low voltage operation (2.7-3.6V)
• Adaptive micro interface enables compatibility
with Intel and Motorola processors
MT88L85AE 24 Pin Plastic DIP (300 mil)
MT88L85AN 24 Pin SSOP
MT88L85AP 28 Pin PLCC
-40°C to +85°C
• DTMF transmitter/receiver power-down via
register control or power-down pin
• Adjustable guard time
m• Automatic tone burst mode
• Call progress tone detection to -30dBm
.coApplications
U• Credit card systems
t4• Paging systems
• Repeater systems/mobile radio
e• Interconnect dialers
• Pay phones
taShe• Remote monitor/Control systems
Description
The MT88L85 is a monolithic DTMF transceiver with
call progress filter. It is fabricated in CMOS
technology offering low power consumption and high
reliability.
The receiver section is based upon the industry
standard MT8870 DTMF receiver. The transmitter
utilizes a switched capacitor D/A converter for low
distortion, high accuracy DTMF signalling. Internal
counters provide a burst mode such that tone bursts
can be transmitted with precise timing. A call
progress filter can be selected allowing a
microprocessor to analyze call progress tones.
The MT88L85 utilizes an adaptive micro interface,
which allows the device to be connected to a number
of popular microcontrollers with minimal external
logic. The MT88L85 provides enhanced power-down
features. The transmitter and receiver may
independently be powered down via register control.
w.DaTONE
D/A
Converters
ww .comIN+
UIN-
et4GS
heOSC1
ataSOSC2
Tone Burst
Gating Cct.
+ Dial
- Tone
Filter
Oscillator
Circuit
Bias
Circuit
Control
Logic
High Group
Filter
Low Group
Filter
Control
Logic
Row and
Column
Counters
Digital
Algorithm
and Code
Converter
Steering
Logic
Transmit Data
Register
Status
Register
Control
Register
A
Control
Register
B
Receive Data
Register
www.DVDD VRef VSS PWDN
ESt St/GT
Figure 1 - Functional Block Diagram
Data
Bus
Buffer
Interrupt
Logic
I/O
Control
D0
D1
D2
D3
IRQ/CP
DS/RD
CS
R/W/WR
RS0
4-71

MT88L85
MT88L85
IN+
IN-
GS
VRef
VSS
OSC1
OSC2
NC
NC
TONE
R/W/WR
CS
1
2
3
4
5
6
7
8
9
10
11
12
24 VDD
23 St/GT
22 ESt
21 D3
20 D2
19 D1
18 D0
17 NC
16 PWDN
15 IRQ/CP
14 DS/RD
13 RS0
NC 5
25 NC
VRef 6
24 D3
VSS 7
23 D2
OSC1 8
22 D1
OSC2 9
21 D0
NC 10
20 NC
NC 11
19 PWDN
24 PIN DIP/SSOP
28 PIN PLCC
Pin Description
Figure 2 - Pin Connections
Pin #
24 28
Name
Description
11
IN+ Non-inverting op-amp input.
22
IN- Inverting op-amp input.
34
GS Gain Select. Gives access to output of front end differential amplifier for connection of
feedback resistor.
46
57
68
VRef
VSS
OSC1
Reference Voltage output (VDD/2).
Ground (0V).
Oscillator input. This pin can also be driven directly by an external clock. CMOS
compatible.
7 9 OSC2 Oscillator output. A 3.579545 MHz crystal connected between OSC1 and OSC2
completes the internal oscillator circuit. Leave open circuit when OSC1 is driven externally.
10 12 TONE Output from internal DTMF transmitter. High impedance when TOUT bit in Control Register
A (CRA) is set to low. Requires resistive termination to Vss.
11 13 R/W(WR) (Motorola) Read/Write or (Intel) Write microprocessor input. CMOS compatible.
12 14
CS Chip Select input must be gated externally by either address strobe (AS), valid memory
address (VMA) or address latch enable (ALE) signal, depending on processor used. See
Figure 12. Must not be tied low. CMOS compatible.
13 15 RS0 Register Select input. Refer to Table 3 for bit interpretation. CMOS compatible.
14 17 DS (RD) (Motorola) Data Strobe or (Intel) Read microprocessor input. Activity on this input is only
required when the device is being accessed. CMOS compatible.
15 18
16 19
IRQ/CP Interrupt Request/Call Progress (open drain) output. In interrupt mode, this output goes
low when a valid DTMF tone burst has been transmitted or received. In call progress mode,
this pin will output a rectangular signal representative of the input signal applied at the input
op-amp. The input signal must be within the bandwidth limits of the call progress filter. See
Figure 10.
PWDN Power-down (input). Active High. Powers down the device and inhibits the oscillator. IRQ
and TONE output are high impedance. Data bus is held in tri-state. This pin has no internal
pulldown resistor. Therefore, must be tied to logic low when not used.
18- 21- D0-D3 Microprocessor data bus. High impedance when CS = 1 or DS =0 (Motorola) or RD = 1
21 24
(Intel). CMOS compatible.
22 26
ESt Early Steering output. Presents a logic high once the digital algorithm has detected a valid
tone pair (signal condition). Any momentary loss of signal condition will cause ESt to return
to a logic low.
4-72


Features MT88L85 3V Integrated DTMF Transceiver w ith Power-Down and Adaptive Micro Inter face Features • • • • • • Complete DTMF transmitter/receiver L ow voltage operation (2.7-3.6V) Adaptiv e micro interface enables compatibility with Intel and Motorola processors DTM F transmitter/receiver power-down via r egister control or power-down pin Adjus table guard time Automatic tone burst m ode Call progress tone detection to -30 dBm DS5032 ISSUE 3 January 1999 Orderi ng Information MT88L85AE 24 Pin Plastic DIP (300 mil) MT88L85AN 24 Pin SSOP MT 88L85AP 28 Pin PLCC -40°C to +85°C D escription The MT88L85 is a monolithic DTMF transceiver with call progress lter. It is fabricated in CMOS technol ogy offering low power consumption and high reliability. The receiver section is based upon the industry standard MT8 870 DTMF receiver. The transmitter util izes a switched capacitor D/A converter for low distortion, high accuracy DTMF signalling. Internal counters provide a burst mode such that tone bursts can be .
Keywords MT88L85, datasheet, pdf, Zarlink Semiconductor, 3V, Integrated, DTMFTransceiver, T88L85, 88L85, 8L85, MT88L8, MT88L, MT88, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)