ADM3315E pra

[ Pobierz całość w formacie PDF ]
a
PRELIMINARY TECHNICAL DATA
15 kV ESD Protected,+2.7V to +3.6V
Serial Port Transceivers with Green-Idle
TM
Preliminary Technical Information
ADM3315E*
FEATURES
Green Idle
TM
Power Saving Mode
Full RS-232 Compliance
Operates with 3V Logic
Low EMI
Ultra Low Power CMOS: 250µA Operation
Low Power Shutdown: 20nA
460 kbits/s Data rate
0.1µF to 1µF Charge Pump Capacitors
Single +2.7V to +3.6V Power Supply
One Receiver Active in Shutdown
ESD >15kV
FUNCTIONAL BLOCK DIAGRAM
C1
0.1µF
C4
1
C3+
23
C3
V+
0.1µF
0.1µF
V
CC
2
C2+
VOLTAGE
TRIPLER/
INVERTER
+3V to ±9V
GND
22
C2
0.1µF
3
V
CC
C3-
21
10µF
0.1µF
CERAMIC
C5
TANTALUM
4
C2
-
V-
20
0.1µF
ENABLE
INPUT
5
EN
C1-
24
SHUTDOWN
INPUT
6
C1+
SD
19
APPLICATIONS
Palmtop Computers
PDAs
Mobile Phone Handsets
Hand-held Devices
Peripherals
T1
IN
7
T1
18
T1
OUT
CMOS
INPUTS*
T2
IN
8
T2
17
T2
OUT
EIA/TIA-232
OUTPUTS
T3
IN
9
T3
16
T3
OUT
R1
OUT
10
R1
15
R1
IN
CMOS
OUTPUTS
R2
OUT
11
R2
14
R2
IN
EIA/TIA-232
INPUTS**
R3
OUT
12
R3
13
R3
IN
GENERAL DESCRIPTION
The ADM3315E is a three driver/three receiver prod-
uct designed to fully meet the EIA-232 standard while
operating with a single +2.7 to 3.6V power supply. The
device features an on-board, charge-pump, DC to DC
converter, eliminating the need for dual power sup-
plies. This DC to DC converter contains a voltage
tripler and voltage inverter, which internally generates
positive and negative supplies from the input 3V power
supply. The DC-DC converter operates in Green Idle
Mode
TM
, whereby the charge pump oscillator is gated
on and off to maintain the output voltage at ±6V under
varying load conditions. This minimizes the power
consumption and makes these products ideal for bat-
tery powered portable devices.
The ADM3315E is suitable for operation in harsh
electricial environments and contains ESD protection
up to ±15kV on the RS-232 I-O lines.
The ADM3315E contains three drivers and three re-
ceivers and is intended for serial port applications
PDAs, Mobile Phone Datacables, and other hand-held
devices.
ADM3315E
Notes:
* INTERNAL 400k
PULL-UP RESISTOR ON EACH CMOS INPUT
** INTERNAL 20k
Ω
PULL-DOWN RESISTOR ON EACH RS-232 INPUT
A shutdown facility is also provided which reduces the
power consumption to 0.07µW. While in shutdown,
one receiver remains active thereby allowing monitor-
ing of peripheral devices. This feature allows the de-
vice to be shutdown until a peripheral device begins
communication. The active receiver can alert the proc-
essor which can then take the ADM3315E out of the
shutdown mode.
The ADM3315E is fabricated using CMOS technology
for minimal power consumption. It features a high
level of overvoltage protection and latch-up immunity.
The ADM3315E is available in a 28 lead TSSOP
package or in a 32 lead 5X5mm LFCSP package.
TM
Green Idle is a registered trademark of Analog Devices inc.
REV. PrA 12/2001
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
ADM3315E–SPECIFICATIONS
PRELIMINARY TECHNICAL DATA
(V
CC
= +2.7V to +3.6V, C1–C5 = 0.1 µF. All specifications T
MIN
to T
MAX
unless
otherwise noted.)
Parameter
Min
Typ
Max
Units Test Conditions/Comments
Operating Voltage Range
+2.7 +3.3 +3.6
V
V
CC
Power Supply Current
0.25
1
mA
Vcc = 2.7V to 3.6V, No Load
35
mA
R
L
= 3k
to GND on all T
OUTS
Shutdown Supply Current
0.02
1
µA
Input Pull-Up Current
10
25
µ A
T
IN
= GND
Input Leakage Current, SD, EN
± 1
µ A
Input Logic Threshold Low, V
INL
0.8
V
T
IN
,
, EN, SHDN
0.4
V
T
IN
,
, EN, SHDN, V
CC
= 2.7V
Input Logic Threshold High, V
INH
2.0
V
T
IN
,
, EN, SHDN
CMOS Output Voltage Low, V
OL
0.4
V
I
OUT
= 1.6 mA
CMOS Output Voltage High, V
OH
V
CC
-0.6
V
I
OUT
= – 200 µA
CMOS Output Leakage Current
0.05
±10
µA
EN = V
CC
, 0 V<R
OUT
< V
CC
Charge Pump Output Voltage, V+
6
V
No Load
Charge Pump Ourtput Voltage, V-
-6
V
No Load
EIA-232 Input Voltage Range
–25
+25
V
EIA-232 Input Threshold Low
0.4
1.3
V
EIA-232 Input Threshold High
2.0
2.4
V
EIA-232 Input Hysteresis
0.14
V
EIA-232 Input Resistance
17
20
23
k W
Output Voltage Swing
±5.0 ±5.5
Volts All Transmitter Outputs
Loaded with 3 k
to Ground
Transmitter Output Resistance
300
W
V
CC
= 0 V, V
OUT
= ±2 V
RS-232 Output Short Circuit Current
±15
±60
mA
Maximum Data Rate
250
460
kbps
R
L
= 3k
to7k
, C
L
= 50pF to 470pF
kbps
R
L
= 3k
to7k
, C
L
= 50pF to 1000pF
Receiver Propagation Delay
T
PHL
, T
PLH
0.3
µs
C
L
= 150 pF
Receiver Output Enable Time, t
ER
100
ns
Receiver Output Disable Time, t
DR
300
ns
Transmitter Propagation Delay
T
PHL
, T
PLH
500
ns
R
L
= 3 k
, C
L
= 1000 pF
Transition Region Slew Rate
6
18
V/µs
R
L
= 3 k
, C
L
= 50 pF to 1000 pF,
V
CC
= 3.0 V
Measured from +3 V to –3 V or
–3 V to +3 V
ESD Protection (I-O Pins)
±15
k V
IEC1000-4-2 Air Discharge
±8
k V
IEC1000-4-2 Contact Discharge
EFT Protection (I-O Pins)
± 2
k V
IEC1000-4-4
EMI Immunity
10
V/m
IEC1000-4-3
Specifications subject to change without notice.
–2–
REV. PrA 12/2001
PRELIMINARY TECHNICAL DATA
ADM3315E
ABSOLUTE MAXIMUM RATINGS*
(T
A
= +25°C unless otherwise noted)
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +4 V
V + . . . . . . . . . . . . . . . . . . . . . . . . . . . . (V
CC
–0.3 V) to +8 V
V – . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V to –8 V
Input Voltages
T
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V)
R
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±30 V
Output Voltages
T
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±15 V
R
OUT
. . . . . . . . . . . . . . . . . . . . . –0.3 V to (V
CC
+0.3 V)
Short Circuit Duration
T
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
JA
CP-32 LFCSP . . . . . . . . . . . . . . . . . . . . . . . . . . 32.5°C/W
RU-28 TSSOP . . . . . . . . . . . . . . . . . . . . . . . . . 68.0°C/W
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . -40°C to +85°C
Storage Temperature Range . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . +300°C
ESD Rating (MIL-STD-883B) (I-O Pins) . . . . . ±15 kV
ESD Rating (IEC1000-4-2 Air) (I-O Pins) . . . . ±15 kV
ESD Rating (IEC1000-4-2 Contact) (I-O Pins) . . ±8 kV
EFT Rating (IEC1000-4-4) (I-O Pins) . . . . . . . . . ±4 kV
*This is a stress rating only and functional operation of the device at these
or any other conditions above those indicated in the operation sections
of this specification is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect reliability.
PIN FUNCTION DESCRIPTION
Mnemonic
Function
V
CC
Power Supply Input +2.7V to +3.6V.
V +
Internally generated positive supply (+6V nominal). Capacitor C4 is connected between V
CC
and V+
V -
Internally generated negative supply (-6V nominal). Capacitor C5 is connected between V- and GND
G N D
Ground pin. Must be connected to 0V.
C1+, C1-
External capacitor 1 is connected between these pins. A 0.1µF capacitor is recommended but larger
capacitors up to 1µF may be used.
C2+, C2-
External capacitor 2 is connected between these pins . A 0.1µF capacitor is recommended but larger
capacitors up to 1µF may be used.
C3+, C3-
External capacitor 3 is connected between these pins. A 0.1µF capacitor is recommended but larger
capacitors up to 1µF may be used.
T
IN
Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels. An internal 400k
pull-up
resistor to V
CC
is connected on each input.
T
OUT
Transmitter(Driver)Outputs (typically ± 5.5V).
R
IN
Receiver Inputs. These inputs accept RS-232 signal levels. An internal 20k
pull-down resistor to GND
is connected on each of these inputs.
R
OUT
Receiver outputs. These are TTL/CMOS levels.
E N
Receiver Enable. A high level three-states all the receiver outputs.
S D
Shutdown Control. A high level will disable the charge pump and reduce the quiescent current to 20nA.
All transmitters and receivers R1and R2 are disabled. Receiver R3 remains active in shutdown.
V+
1
2
3
24
23
22
C3+
C2+
GND
Vcc
C3+
C2-
4
5
21
20
V-
Table I. ADM3315E Truth Table
EN
1
2
3
4
5
6
7
8
PIN 1
IDENTIFIER
24
C1-
EN
C1-
E
EN
Status T
OUT
1-3 R
OUT
1-2 R
OUT
3
C1+
23
SD
ADM3315E
SD
EN
C1+
6
19
SD
NC
22
NC
T1
IN
21
T1
OUT
T1
IN
T2
IN
7
18
T1
OUT
T2
OUT
T3
OUT
0 0 Normal Enabled Enabled Enabled
Operation
0 1 Normal Enabled Disabled Disabled
Operation
1 0 Shutdown Disabled Disabled Enabled
1 1 Shutdown Disabled Disabled Disabled
T2
IN
20
T2
OUT
TOP VIEW
(Not to Scale)
T3
IN
19
T3
OUT
8
9
10
17
16
15
NC
18
NC
T3
IN
NC
17
NC
R1
OUT
R1
IN
R2
OUT
11
14
13
R2
IN
R3
OUT
12
R3
IN
Pin Configurations
REV. PrA 12/2001
–3–
Thermal Impedance,
E
EN
PRELIMINARY TECHNICAL DATA
ADM3315E
Typical Performance Characteristics
TPC 1. EMC Conducted Emissions
TPC 4. Transmitter Output vs. Load Capacitance
TPC 2. EMC Radiated Emissions
TPC 5. I
CC
vs. V
CC
(Unloaded)
TPC 3. Charge Pump V+, V- vs. Load Current
TPC 6. I
CC
vs. V
CC
(R
L
= 3k)
–4–
REV. PrA 12/2001
PRELIMINARY TECHNICAL DATA
ADM3315E
TPC 7. Slew Rate vs. Load Capacitance
TPC 10. Oscillator Frequency vs. Load Current
TPC 8. Supply Current vs. Load Capacitance
(R
L
= 3k)
TPC 11. Transmitter Output (High) Exiting Shutdown
TPC 9. Supply Current vs. Load Capacitance
(R
L
= infinite)
TPC 12. Transmitter Output (Low) Exiting Shutdown
REV. PrA 12/2001
–5–
[ Pobierz całość w formacie PDF ]