U3761MB-XFNG3G [ATMEL]
Telephone Multifunction Circuit, PDSO44, LEAD FREE, SSOP-44;
| 型号： | U3761MB-XFNG3G |
| 厂家： | 
ATMEL |
| 描述： | Telephone Multifunction Circuit, PDSO44, LEAD FREE, SSOP-44 电信 光电二极管 电信集成电路 |
| 文件： | 总27页 (文件大小：484K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Features
Speech Circuit
•
•
•
•
Adjustable DC Characteristic
Symmetrical Input of Microphone Amplifier
Receiving Amplifier for Dynamic or Piezo-electric Earpieces
Automatic Line-loss Compensation
Universal
Dialer
•
•
•
•
•
•
•
•
•
•
•
•
•
•
DTMF/Pulse Switchable
Telephone IC -
All Functions
Integrated
Pulse Dialing 66/33 or 60/40 or DTMF Dialing Selectable by Pin
Selectable Flashing Duration by Key Pad
Pause Function
Optical Indication of Temporary DTMF Mode
Keytone for Pulse Dialing
Last Number Redial up to 32 Digits
Three by 17 Digits Direct (One-touch) Memory
Ten by 17 Digits Indirect (Two-touch) Memory
Notice Function up to 32 Digits
U3761MB-X
Standard Low-cost Crystal 3.58 MHz or Ceramic Resonator
Handset Mute (Privacy) with Optical Indication
Additional Toggle Flipflop
Internal Loop Interrupt Detection
Tone Ringer
•
•
•
•
2-tone Ringer
Adjustable Volume
RC Oscillator
Adjustable Threshold
Benefits
•
•
Low Number of External Components
High Quality through One IC Solution
Electrostatic sensitive device.
Observe precautions for handling.
1. Description
Atmel’s low-voltage telephone circuit U3761MB-X performs all the speech and line
interface functions required in an electronic telephone set, a tone ringer, a pulse and
DTMF dialing with redial, notice function, and 13 memories. Operation below 15 mA is
possible with reduced performance.
Rev. 4791C–CORD–10/05
Figure 1-1. Block Diagram
Important note:
Application examples have not been examined for
series use or reliability, and no worst case scenarios
have been developed. Customers who adapt any of
these proposals must carry out their own testing and
be convinced that no negative consequences arise
from the proposals.
2
U3761MB-X
4791C–CORD–10/05
U3761MB-X
2. Pin Configuration
Figure 2-1. Pinning SSO44
C1
C2
C3
C4
1
2
3
4
5
6
7
8
9
44
43
42
41
40
39
38
37
R4
R3
R2
R1
Mask
Earth
HFI
DP
HFO
MODE
KT
XT
XT
U3761MB-X
36
35
34
33
32
31
30
29
28
27
26
25
HKS
NC
MFO 10
TEST
MFIND 11
GND
VDD
OUT
12
13
MIC 1
MIC 2 14
RCK
MICO
15
VRING
VRIAC
16
17
VL
RDC
AGC
THA
ST
TIN 18
19
VI
MUTE 20
CLIM
21
22
24
23
PRIND
RECIN
RECO 1
RECO 2
3
4791C–CORD–10/05
Table 2-1.
Pin Description
Pin
1
Symbol Function
Configuration
C1
C2
C3
2
VDD
3
C1
VDD
Keyboard input
PD
VDD
4
C4
C2-C4
VDD
PD = Protection Device
VDD
EARTH
5
6
7
Earth
Earth key (604 ms high pulse, 1s pause)
PD
VDD
Toggle flipflop input
Input with 200 kΩ pull-down resistor
HFI triggers HFO with each LOW/HIGH edge
HFI
HFI
VDD
PD
VDD
HFO
HFO
Output will be toggled by each LOW/HIGH edge at HFI
PD
4
U3761MB-X
4791C–CORD–10/05
U3761MB-X
Table 2-1.
Pin
Pin Description
Symbol Function
Configuration
VDD
XT
XT
VDD
8
9
XT
A built-in inverter provides oscillation with an inexpensive
3.579545-MHz crystal or ceramic resonator
PD
XT
VDD
VDD
PD
Output of DTMF
DTMF output frequency
Specified (Hz) Actual (Hz) Error (%)
VDD
R1 697
R2 770
R3 852
R4 941
C1 1209
C2 1336
C3 1477
699...... ......+0.28
766...... ......–0.52
848...... ......–0.47
940...... ......–0.10
1216..... ......+0.57
1332..... ......–0.30
1472..... ......–0.34
MFO
10
MFO
VDD
PD
VDD
During the temporary DTMF mode the output switches to
low
MFIND
11
12
MFIND
GND
Reset by on hook condition
MFIND
Maximum voltage at MFIND = 5.5V
PD
Ground
VI
1 V
50K
PD
MIC1
13
14
MIC 1 Inverting input of microphone amplifier
MIC2
MIC 2 Non-inverting input of microphone amplifier
50K
1 V
VI
PD
5
4791C–CORD–10/05
Table 2-1.
Pin
Pin Description
Symbol Function
Configuration
VI
1 V
Transmit pre-amp output which is normally capacitively
coupled to Pin TIN
15
MICO
16K
MICO
PD
VL
16 V
PD
Positive supply voltage input to the device. The current
through this pin is modulated by the transmit signal.
16
VL
RDC
PD
VL
An external resistor (1W) is required from this pin to GND to
control the DC input impedance of the circuit. It has a
nominal value of 39Ωfor low-voltage operation. Values up to
100Ωmay be used to increase the available transmit output
voltage swing at the expense of low-voltage operation.
AGC
RDC
17
RDC
PD
PD
1 V
5.6K
Input to the line output driver amplifier. Transmit AGC
applied to this stage.
18
19
TIN
TIN
16 V
PD
This internal voltage bias line must be connected to VL via
an external resistor which dominates the AC input
impedance of the circuit and should be 680Ωfor an 600-Ω
input impedance or 1.2 kΩ for a 900-Ω input impedance.
VI
VI
16 V
PD
6
U3761MB-X
4791C–CORD–10/05
U3761MB-X
Table 2-1.
Pin
Pin Description
Symbol Function
Configuration
VBG
Pin for testing
30K
Forcing MUTE to GND mutes the microphone and
decreases the earpiece signal by typically 29 dB; no pull up
circuit allowed
MUTE
20
MUTE
MUTE
6.7 V
PD
PRIVACY indication pin
PRIND Open collector with minimum 1 mA drive current to GND
when PRIVACY = active
VL
PRIND
21
22
6.7V
PD
Receive amplifier input. The receiving amplification is
regulated by an AGC.
RECIN
60K
RECIN
VL
23
24
RECO2 Output of the receive amplifier. Dynamic transducers with a
minimum impedance of 100Ωcan be directly driven by these
RECO1 outputs.
60K
1 V
RECO2
RECO1
6.7 V
PD
VL
Time constant of anticlipping in transmit path.
IDC
25
CLIM
CLIM ≥ 2.2 µF
CLIM
CLIM = GND: anticlipping inactive
6 V
PD
The output of the sidetone cancellation signal, which
requires a balanced impedance of 8 to 10 times the
subscriber’s line impedance to be connected to pin VL.
26
ST
ST
16 V
PD
7
4791C–CORD–10/05
Table 2-1.
Pin
Pin Description
Symbol Function
Configuration
VRIAC
140K
12K
1 V
27
THA
Ringer threshold adjustment
20K
6 V
6 V
THA
PD
VL
The range of transmit and receive gain variations between
short and long loops may be adjusted by connecting a
resistor RAGC from this pin to (GND). This pin can be left
open to set AGC out of action.
AGC
RDC
28
AGC
PD
PD
70K
10K
VRIAC
29
VRIAC Ringing supply
50 V
PD
VRING
OUT
200
DC supply voltage for the tone ringer is limited to 30V with
integrated Z-diode.
30 V
6.5K
30
VRING
PD
PD
50 V
3.4 V
0.8 V
31
RCK
RC clock oscillator for ringer
RCK
6 V
6 V
PD
8
U3761MB-X
4791C–CORD–10/05
U3761MB-X
Table 2-1.
Pin
Pin Description
Symbol Function
Configuration
VRING
OUT
200
30 V
50 V
6.5K
32
OUT
Buzzer output
PD
PD
VL
33
VDD
Supply output for dialer part
6 V
VDD
6 V
PD
VDD
VDD
34
Test
Test input with 6.25 kΩ pull-up resistor
TEST
VDD
PD
35
36
NC
Not connected
Hook switch input
VDD
HKS = 0: On-hook state. Chip in sleep mode, no operation
(external pull-down resistor recommended)
HKS = 1: Off-hook state. Chip enable for normal operation
HKS
HKS
IHKS ≤ 0.5 mA
PD
VDD
Keytone output signal which is sent out in pulse dialing
mode with a keytone frequency of 582 Hz.
KT sink/drive current is about 100 µA at VDD = 2.5V
KT
37
KT
VDD
PD
9
4791C–CORD–10/05
Table 2-1.
Pin
Pin Description
Symbol Function
Configuration
Pulling MODE pin to:
C3: tone mode with 87 ms burst time and 140 ms pause
C4: tone mode with 87 ms DTMF burst and 87 ms pause
R1: pulse mode with 20 pps, Make/Break = 40/60
R2: pulse mode with 20 pps, Make/Break = 33/66
MODE R3: pulse mode with 10 pps, Make/Break = 40/60
R4: pulse mode with 10 pps, Make/Break = 33/66
C1: pulse mode with 10 pps, Make/Break = 33/66 and temp.
DTMF with 87 ms DTMF burst, 140 ms pause
VDD
MODE
38
VDD
PD
MODE pin pulled to R4: with temporary DTMF, 87 ms DTMF
burst and 87 ms pause
VDD
Pulse dialing output. Flash key will cause DP to be active in
either DTMF mode or pulse mode.
DP
39
DP
In on-hook state is DP = VDD
PD
VDD
Short mute during pulse dialing, active high
During MASK an internal NPN transistor shortens VL
against VI.
MASK
40
Mask
PD
41
42
43
R1
R2
R3
VDD
R1
VDD
Keyboard input
PD
VDD
44
R4
R2-R4
VDD
PD
10
U3761MB-X
4791C–CORD–10/05
U3761MB-X
3. Keyboard Operation
C1
C2
C3
C4
1
2
3
S
M1
R1
R2
4
5
6
M2
7
8
0
9
#
A
R/P
E
M3
N
R3
R4
*/T
←
F1
F2
F3
^
• S: Store function key
• A: Indirect repertory dialing function key (LN 0 to 9)
• R/P: Redial and pause function key
• N: Notice function
• */T: * function; pulse-to-tone function
• M1 to M3: One-touch memory
• F1, F2, F3: Flash keys
3.1
3.2
Normal Dialing
Redialing
OFF HOOK, D1, D2, ..., Dn
1. D1, D2, ..., Dn will be dialed out.
2. Dialing length is unlimited, but redial is inhibited if length oversteps 32 digits.
3. If redialing length oversteps 32 digits, the redialing function will be inhibited.
OFF HOOK, D1, D2, ..., Dn BUSY, Come ON HOOK, OFF HOOK, R/P
The R/P key can execute the redial function only as the first key-in after off-hook;
otherwise, it executes the pause function (3.6 s).
Keys stored in redial memory: 0 to 9, #, R/P, A, M1, M2, M3, N, * (only tone mode)
Characters F1, F2, F3, Earth, (* in pulse mode) can only be stored in Mn, Ln and N memory.
Characters F1, F2, F3, Earth, (* in pulse mode) will not be dialled out from redial memory; dial-
ling out was stopped, when recognizing one of the above characters.
Example:
OFF/ HOOK, D1, D2, F1, D4, D5, S, S, M1
a) ON/OFF-HOOK, R/P
b) ON/OFF-HOOK, M1
only D1, D2 will be dialed out, then dialing out stops
D1, D2, F1, D4, D5 will be dialed out
Content of redial memory can be copied to Mn, Ln, N; but copying memory Mn, Ln, N to itself or
to another memory (except redial memory) will erase the destinated memory.
11
4791C–CORD–10/05
Example:
OFF/ HOOK, D1, D2, ... Dn
a) ON/OFF-HOOK, R/P, N.
D1, ... Dn copied to N
b) ON/OFF-HOOK, R/P, S, S, Mn (or Ln)
D1, ... Dn copied to Mn (or Ln)
but
OFF/ HOOK, M1
content of M1 will be dialed out
a) ON/OFF-HOOK, R/P, S, S, M2
b) ON/OFF-HOOK, M1, S, S, M2
not possible, M2 will be erased
not possible, M2 will be erased
3.3
Number Store
OFF HOOK, D1, D2, ..., Dn, S, S, Mn (or Ln)
1. D1, D2, ..., Dn will be stored in memory location only (not in redial memory) and dialed
out.
OFF HOOK S, D1, D2, ..., Dn, S, Mn (or Ln)
2. D1, D2, ..., Dn will be stored in memory location but will not be dialed out.
3. R/P and */T keys can be stored as a digit in memory, also F1, F2, F3, Earth. In store
mode, R/P is the pause function key; */T is the pulse-to-tone function key.
4. The store mode is released after the store function is executed or when the state of the
hook switch is changed.
5. Number store can be linked without going ON/OFF-Hook
Example:
OFF/HOOK
S, D1, D2, ... Dn, S, M1
storing D1, D2, ... Dn to M1
storing D1', D2', ... Dn' to M2
S, D1', D2', ... Dn', S, M2 ...
3.4
3.5
Repertory Dialing
1. OFF HOOK, Mn
2. OFF HOOK, A, Ln
Notice (N)
OFF HOOK D1, D2, ..., Dn, N
1. If the dialing of D1 to Dn is finished, pressing the N key will cause D1 to Dn to be copied
to the N memory.
2. Pressing key N again, after D1, D2, ... Dn was copied to N, N will be dialed out again
OFF HOOK , N
3. D1 to Dn will be dialed out after the N key is pressed.
4. Notice function is valid as first key only.
3.6
Cascaded Dialing
1. Normal dialing + Repertory dialing + Normal dialing
2. Repertory dialing + Normal dialing + Normal dialing
3. Redialing + Normal dialing + Repertory dialing
4. Redialing is valid as first key-in only.
12
U3761MB-X
4791C–CORD–10/05
U3761MB-X
Figure 3-1. Pulse Mode Normal Dialing
HKS
tKRD
KEY IN
3
4
2
2
tKID
tKID
DP
MUTE
MASK
B M
tPDP
B M
tIDP
tIDP
tIDP
tIDP
tPDP
Low
MFO
OSC
Oscillation
Figure 3-2. Pulse Mode Auto Dialing, t < tOHD
HKS
tKRD
t < tOHD
KEY IN
DP
R/P
tKID
B M
tPDP
B M
tIDP
tIDP
tIDP
MUTE
MASK
Low
MFO
OSC
Oscillation
13
4791C–CORD–10/05
Figure 3-3. Pulse Mode Auto Dialing, t > tOHD
HKS
tKRD
t > tOHD
KEY IN
DP
R/P
tKID
B M
tPDP
B M
tIDP
tIDP
MUTE
MASK
Low
MFO
OSC
Oscillation
Figure 3-4. DTMF Mode Normal Dialing
HKS
tKRD
KEY IN
3
4
2
5
tKID
DTMF
MUTE
tTD
tITP
tITP
tITP
Low
High
MASK
DP
Oscillation
OSC
14
U3761MB-X
4791C–CORD–10/05
U3761MB-X
Figure 3-5. DTMF Mode Auto Dialing (t < tOHD
)
HKS
tKRD
t < tOHD
KEY IN
R/P
tKID
DTMF
tTD
tITP
tITP
MUTE
Low
High
MASK
DP
Oscillation
OSC
Figure 3-6. DTMF Mode Auto Dialing (t > tOHD
)
HKS
tKRD
t > t OHD
KEY IN
R/P
tKID
DTMF
tTD
tITP
MUTE
Low
MASK
DP
High
Oscillation
OSC
15
4791C–CORD–10/05
3.7
Access Pause
OFF HOOK, D1, D2, R/P, D3, ..., Dn'
1. The pause function can be stored in the memory.
2. The pause function is executed in normal dialing and redialing.
Figure 3-7. Pause Function
HKS
KEY IN
DP
2
R/P
3
tKID
tIDP
tPDP
tPDP
MUTE
MASK
tP
Low
MFO
OSC
Oscillation
3.8
Pulse-to-tone (*/T)
OFF HOOK, D1, D2, ..., Dn, */T, D1', D2' , ..., Dn'
1. If the mode switch is set to pulse mode, then the output signal will be:
D1, D2, ..., Dn, Pause (3.6s), D1', D2' ,..., Dn'
(Pulse)
(Tone)
2. If the mode switch is set to tone mode, then the output signal will be:
D1, D2, ..., Dn,
(Tone)
*
, D1', D2', ..., Dn'
(Tone)
(Tone)
3. The dialer remains in tone mode when the digits have been dialed out and can be reset
to pulse mode by going on-hook only.
4. ON/OFF-HOOK, R/P
D1, D2, Dn dialed out, then further dialing out stops and
remains in pulse mode, when dialling from redial memory.
5. If characters are stored in Mn, Ln or N, dialing out will be the same in pulse mode as
point 1.
16
U3761MB-X
4791C–CORD–10/05
U3761MB-X
Figure 3-8. Pulse-to-tone Operation
HKS
KEY IN
2
*/T
3
tKID
DP
tIDP
tPDP
MUTE
tP
MASK
MFO
Oscillation
OSC
MFIND
3.9
Flash (F1 or F2 or F3)
OFF HOOK, Fn
1. The dialer will execute a flash break and the entire flash pause time will elapse before
the next digits are dialed out.
2. The flash key can be stored as a digit in the memory. Only one flash, however, will be
released to the users.
3. The system will return to the initial state after the flash pause time has elapsed.
17
4791C–CORD–10/05
Figure 3-9. Flash Operation
High
HKS
KEY IN
F
F
3
tKID
t FB
DP
t FP
t FP
MUTE
MASK
MFO
t ITP
Oscillation
OSC
t
t
t
t
t
t
t
t
KID = key active in debounce
KRD = key release debounce
PDP = pre-digit pause
IDP = inter-digit pause
TD = DTMF output duration
ITP = intertone pause
FB = flash break time
FP = flash pause time
tP = pause time
Figure 3-10. Symbolic Timing Diagram: Earth Function
KEY IN
DP
MUTE
Low
MASK
EARTH
18
U3761MB-X
4791C–CORD–10/05
U3761MB-X
Figure 3-11. Symbolic Timing Diagram: HFI, HFO Function
HFI
HFO
Figure 3-12. Symbolic Timing Diagram: On Hook Debounce Time
Off hook
HKS
On hook
XT
165 ms
Figure 3-13. HKS Threshold Voltage
60
55
50
45
40
35
switch on
switch off
30
2.0
2.5
3.0
3.5
4.0
4.5
5.0
VDD (V)
19
4791C–CORD–10/05
4. Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameters
Symbol
IL
Value
140
Unit
mA
V
Line current
DC line voltage
VL
14
DC voltage at pins 1 to 11 and 33 to 44
Junction temperature
VDC
Tj
5.5
V
125
°C
°C
°C
W
Ambient temperature
Tamb
Tstg
Ptot
–25 to +75
–55 to +150
0.9
Storage temperature
Total power dissipation, Tamb = 60°C, SSO44
Junction ambient, SSO44
RthJA
70
K/W
Note:
ESD withstand voltage 1 kV according to ESD standard S5.1 (HBM)
5. Electrical Characteristics: Speech Circuit
Reference point pin GND, f = 1000 Hz, 0 dBm = 775 mVrms, RDC = 39Ω/1W, Tamb = 25°C, unless otherwise specified, refer to “Basic Test
Circuit”. CLIM = GND
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
IL = 8 mA
1.4
3.85
6.55
V
V
V
V
IL = 20 mA
IL = 73 mA
IL = 100 mA
3.6
5.9
6.9
4.1
7.2
8.2
Line voltage
VL
Transmit and Sidetone
Input resistance
Ri
Ri
Gs
45
80
120
48.8
0.5
0.5
–4.8
2
kΩ
dB
dB
dB
dB
%
Gain
IL = 20 mA, S5 = open
IL = 20 to 60 mA, RAGC = infinite
Tamb = –10 to +60°C, IL = 20 mA
RAGC = 12 kΩ, IL = 73 mA
IL = 20 mA, S5 = open
46.8
–0.5
–0.5
–7
47.8
Gain change with current
Gain deviation
∆GS
∆GS
∆Gs
dt
Line-loss compensation
Distortion at line VL = 0.775 Vrms
–6
Maximum output voltage
at line d ≤ 5%
IL = 20 mA, Vmic = 10 mV,
CLIM = 2.2 µF, S1 = open
VLmax
tatt
1.2
3.5
dBm
ms
Attack time transmit anticlipping
CLIM = 2.2 µF
Noise at line weighted
psophometrically
IL > 20 mA, GS = 48 dB
IL ≥ 20 mA
no
–72
20
dBmp
dB
Sidetone reduction
DTMF Amplifier
GSTA
10
15
Volume range d < 5%
Single tone, IL ≥ 20 mA
VL
VL
1.3
dBm
dBm
DTMF output level low frequency
group
IL = 20 mA, S5 = closed
Tamb = –5°C to +60°C
–7.6
–4.6
3.1
Pre-emphasis between high- and
low-level frequency group
PPRE = PHLG – PLLG, S5 = closed,
Tamb = –5°C to +60°C
PPRE
THD
1.9
2.5
dB
Total harmonic distortion relative to
sum level of low and high frequency
group signal
IL ≥ 20 mA, measured at pin MFO
–33
–25
dBr
20
U3761MB-X
4791C–CORD–10/05
U3761MB-X
5. Electrical Characteristics: Speech Circuit (Continued)
Reference point pin GND, f = 1000 Hz, 0 dBm = 775 mVrms, RDC = 39Ω/1W, Tamb = 25°C, unless otherwise specified, refer to “Basic Test
Circuit”. CLIM = GND
Parameters
Receiving Amplifier
Gain
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
IL ≥ 20 mA
GR
3
5
dB
dB
IL = 20 to 60 mA
Gain change with current
∆GR
–0.5
+0.5
RAGC = infinite
Tamb = –10 to +60°C
IL = 20 mA
Gain deviation
∆GR
DGR
ni
–0.3
–7
+0.7
–4.7
–71
34
dB
dB
Line-loss compensation
IL = 73 mA
IL = 73 mA
IL ≥ 20 mA
-6
–77.5
29
Receiving noise at earphone
weighted psophometrially
dBm
dB
Gain change when muted
GRM
VRECO
24
IL ≥ 20 mA, Zear = 68 nF, 100Ωin
series, d ≤ 2%
Output voltage push-pull
0.8
0.9
Vrms
IL = 40 mA, Vgen = 4 Vrms
Zear = 68 nF + 100Ω
,
Ear protection differential
Vear
1.3
1.6
2.5
6.3
Vrms
Supply Voltage (For Internal Use Only)
Output voltage
Note: Output must be limited
externally to 5.5V maximum
IL ≥ 20 mA dialing mode
VDD
IDD
2.0
V
Available current for peripherals
IL ≥ 20 mA dialing mode
150
µA
Transmit
Maximum output voltage swing at
line
IL = 20 mA, VMIC = 50 mVrms
IL = 20 mA
VL max
3.4
4
Vpp
dB
Mute suppression transmit with
privacy function
GSPRIV
60
6. DC Characteristics Dialer
VDD = 2.7V, fOSC = 3.58 MHz, all outputs unloaded, S9 closed; HKS = 1
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
µA
V
Memory retention current
Data retention voltage
DTMF distortion
HKS = 0, VDD = 1.0V
IMR
0.1
0.5
RL = 5 kΩ
VPO = 0.5V
VI = 0V
d
–30
–23
dB
mA
µA
µA
kΩ
kΩ
mA
mA
MΩ
V
DP output sink current
Keyboard input drive current
Keyboard input sink current
Key on resistance
IPL
0.5
IKD
20
VI = 2.7V
IKS
500
RKON
RKOFF
IM H/L
Ie H/L
Riso
5
Key off resistance
100
0.5
0.5
4.7
Mask sink/drive current
Earth sink/drive current
Isolation resistance XT/XT
Maximum voltage at HKS
Maximum input current at HKS
5.5
0.5
mA
21
4791C–CORD–10/05
7. AC Characteristics Dialer
VDD = 2.7V, fOSC = 3.58 MHz, all outputs unloaded, S9 closed; HKS = 1
Parameters
Test Conditions
Symbol
tKID
Min.
15
Typ.
20
Max.
25
Unit
ms
Keypad active in debounce mode
Key release debounce
tKRD
15
20
25
ms
MODE pin = R3 (10 pps)
MODE pin = C1, C4 (10 pps)
tPDP
tPDP
37
31
40
33.3
41
33.5
ms
ms
Pre-digit pause
MODE pin = R1 (20 pps)
MODE pin = R2
tPDP
tPDP
20
16.65
ms
ms
10 pps, tIP = tIDP + tPDP
20 pps
tIP
tIP
836
512
ms
ms
Inter-digit pause (auto dialing)
Make/break ratio
810
860
MODE pin = R1 (20 pps), R3 10 pps)
MODE pin = C1, R4 (10 pps) R2
(20 pps)
40.8:60.2 40:60 39.2:60.8
%
M/B
35.6:64.4 33:67 31.2:68.8
%
Auto dialing, MODE = C4
MODE = C3
84
84
87
87
90
90
DTMF output duration
Inter-tone pause
tTD
ms
Auto dialing, MODE = C4
MODE = C3
84
135
87
140
90
147
tITP
ms
Flash break time
F1
F2
F3
C1 connected to GND
C2 connected to GND
C3 connected to GND
95
245
590
98
250
604
101
255
610
ms
ms
ms
tFB
Rise time of leading edge at HKS
Flash pause time
Pause time
20 to 70% of VDD
F1, F2, F3
trHKS
tFP
tP
10
1.1
3.7
185
ms
s
0.9
3.5
1
3.6
165
604
1
s
On-hook debounce time
Earth time
tohd
tet
145
ms
ms
s
C4 connected to GND
Earth pause time
tpt
0.9
1.1
MODE pin = R3
MODE pin = C1, R4
57.6
63
60
66.7
62.4
69
ms
ms
tB
tB
tM
tM
Break duration
MODE pin = R1 (20 pps)
MODE pin = R2
30
33.35
ms
ms
MODE pin = R3
MODE pin = C1, R4
38
31
40
33.3
41
35
ms
ms
Make duration
MODE pin = R1 (20 pps)
MODE pin = R2
20
16.65
ms
ms
MODE pin = C1, R3, R4
tP
tP
95
100
50
105
ms
ms
Break + make duration
MODE pin = R1, R2 (20 pps)
22
U3761MB-X
4791C–CORD–10/05
U3761MB-X
8. Electrical Characteristics Tone Ringer
fRCK = 4 kHz, VRING = 20V, Tamb = 25°C, reference point GND, unless otherwise specified
Parameters
Test Conditions
VRIAC = 20V
Symbol
IRING
Min.
2.1
8
Typ.
Max.
3.8
10
Unit
mA
V
Supply current, outputs open
Switch-on threshold
Switch-off threshold
VRIAC, THA = open
VRIAC
VRON
9
VROFF
5.0
5.6
6.5
V
R = 150 kΩ, C = 1 nF
VRIAC > VRON
f1H
f1L
937
752
1010
808
1083
868
Hz
Hz
Ringing frequency
C
R
1000
50
2200
330
pF
kΩ
Hz
Vpp
ms
Range of external components for
R/C oscillator
Audio sequence frequency
Output voltage swing
Turn-off delay
f2
11.5
21
12.5
23
14.0
VRing = 25V, Cout = 68 nF
See Figure 3-13
Vout
toff
65
100
Note:
Max. current into internal zener diode at pin VRING = 20 mA
Figure 8-1. Turn-off Delay Time
Volt
VRING
0
t
VRIAC
0
t
OUT
Melody
t
0
toff
8.1
Note
The oscillator frequency is defined by R and C at pin RCK.
1
--------------------------------------------------------------------
≈
fOsc
1.594 × C × [R + 3809 Ω]
The audio sequence frequency f2 and the ratio of low frequency f1L and high frequency f1H are
derived from the oscillator by internal deviders. So f2, f1H and f1L are given by:
fOsc
f2 = ---------
320
f
f1H = --O----s--c-
4
f
f1L = --O----s--c-
5
;
;
For more information on adjusting ringer melody refer to the document “Application and Adjust-
ment Hints”.
23
4791C–CORD–10/05
Figure 8-2. Basic Test Circuit
O / I
O / I
T U O
r e t s e t o T
r e t s e t o T
r e t s e t o T
24
U3761MB-X
4791C–CORD–10/05
U3761MB-X
9. Equations for Electrical Characteristic Parameters of the Speech Circuit
The equations refer to the basic test circuit. If not otherwise specified, the switches in the basic
test circuit are inactive.
9.1
Transmit Gain
VL
------------
GS = 20 × log
VMIC
VMIC = 3 mV/1 kHz, S5 = open
9.2
9.3
9.4
Line-loss Compensation Transmit
∆GS = GS (at IL = 73 mA) - GS (at IL = 20 mA)
TX-mode: VMIC = 3 mV/1 kHz, S5 = open
Line-loss Compensation Receive
∆GR = GR (at IL = 73 mA) - GR (at IL = 20 mA)
RX-mode: Vgen = 300 mV/1 kHz, S7b
Receiving Gain
VRECO
-----------------
VL
GR = 20 × log
RX-mode: Vgen = 300 mV/1 kHz, S7b
9.5
9.6
Sidetone Reduction
VL
-----------------
VRECO
GSTA = 20 × log
(in TX-mode) + GR
TX-mode: VMIC = 3 mV/1 kHz, S5 = open
Input Impedance of Microphone Amplifier
50 k
Ri = ------------------------------------------------
VL(S6 = closed)
--------------------------------- – 1
VL(S6 = open)
TX-mode: VMIC = 3 mV/1 kHz, S5 = open
9.7
Gain Change when Muted
VRECO
VRECO
-----------------
VL
-----------------
GRM = 20 × log
(Mute = inactive) - 20 × log
(Mute = active)
VL
V
gen = 100 mV/1 kHz, S5 = open, S8 = open
25
4791C–CORD–10/05
9.8
Total Harmonic Distortion (THD)
2
n1 × ULG2 + n1 × UHG2 + n2 × ULG2 + n2 × UHG2 + ...nn × ULG2 + nn × UHG
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
THD = 20 × log
ULG2 + UHG
2
n1, ... nn = harmonics of high and low frequency group
10. Ordering Information
Extended Type Number
Package
SSO44
SSO44
Remarks
U3761MB-XFNG
Tube, Pb-free
U3761MB-XFNG3G
Taped and reeled, Pb-free
11. Package Information
9.15
8.65
Package SSO44
Dimensions in mm
18.05
17.80
7.50
7.30
2.35
0.3
0.8
0.25
0.10
0.25
10.50
10.20
16.8
44
23
technical drawings
according to DIN
specifications
1
22
26
U3761MB-X
4791C–CORD–10/05
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