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DS4000
Digitally Controlled TCXO
www.maxim-ic.com
GENERAL DESCRIPTION
The DS4000 digitally controlled temperature-compen-
sated crystal oscillator (DC-TCXO) features a digital
temperature sensor, one fixed-frequency temperature-
compensated
square-wave
output
(F
1
),
one
programmable temperature-compensated square-
wave output (F
2
), and digital communication for
frequency tuning (SDA, SCL).
FEATURES
§
§
§
Aging
≤1.0ppm
(First Year)
Frequency Stability ±1.0ppm from -40°C to +85°C
Frequency Versus Supply Stability of ±1.0ppm per
Volt
Base Frequency is Digitally Tunable by ±10ppm
One Fixed-Frequency Output and One
(n + 1) or 2(n + 1) Division of the Base
Frequency Output
Temperature Measurements from -40C° to +85°C
with 10-Bit/+0.25°C Resolution and ±3°C
Accuracy
2-Wire Serial Interface
APPLICATIONS
Reference Oscillators in PLL Circuits
Global Positioning Systems
SATCOM
Telecom
Wireless Base Stations
§
§
PIN CONFIGURATION
TOP VIEW
A
B
6
5
4
3
2
1
C
D
F2
V
CC
F1
V
OSC
GND
GND
ORDERING INFORMATION
PART
DS4000
DS4000N
TEMP RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
24 BGA
24 BGA
SCL
SDA
A0
GND
OSC
N.C.
GND
Selector Guide appears end of data sheet.
BGA
Note:
Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here:
www.maxim-ic.com/errata.
1 of 16
REV: 072403
DS4000 Digitally Controlled TCXO
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground
Storage Temperature Range
Operating Voltage Range
Operating Temperature Range
Commercial
Industrial
Soldering Temperature
-0.3V to +6.0V
-55°C to +85°C
V
CC
= 5V ±5%
0°C to +70°C
-40°C to +85°C
See IPC/JEDEC J-STD-020A (2x max)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is
not implied. Exposure to absolute maximum rating conditions for extended periods can affect device reliability.
RECOMMENDED DC OPERATING CONDITIONS
(V
CC
= 5V ±5%, over the operating temperature range.)
PARAMETER
Supply Voltage
Oscillator Supply Voltage
Input Logic High
Input Logic Low
SYMBOL
V
CC
V
OSC
V
IH
V
IL
CONDITIONS
(Notes 1, 2)
(Notes 1, 2)
(Note 1)
(Note 1)
MIN
4.75
4.75
2.2
-0.3
TYP
5.0
5.0
MAX
5.25
5.25
V
CC
+ 0.3
+0.8
UNITS
V
V
V
V
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 5V ±5%, over the operating temperature range.)
PARAMETER
Active Supply Current
Active Oscillator Supply Current
Output Logic High 2.4V
Output Logic Low 0.4V
Input Leakage
I/O Leakage
Temperature Conversion Time
SYMBOL
I
CC
I
OSC
I
OH
I
OL
I
LI
I
LO
t
CONVT
(Note 3)
250
CONDITIONS
(Notes 3, 4)
(Notes 3, 4)
(Note 1)
(Note 1)
-1
4
1
1
300
MIN
TYP
1.5
3.5
MAX
2
5.5
UNITS
mA
mA
mA
mA
mA
mA
ms
Note 1:
All voltages are referenced to ground.
Note 2:
For ±10% operating range, contact factory.
Note 3:
Typical values are at +25°C and nominal supplies.
Note 4:
These parameters are measured with the outputs disabled.
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DS4000 Digitally Controlled TCXO
AC ELECTRICAL CHARACTERISTICS: TCXO
(V
CC
= 5V ±5%, over the operating temperature range.)
PARAMETER
Output Frequency
Frequency Stability vs.
Temperature
Frequency Stability vs. Voltage
Frequency Stability vs. Aging
F
1
, F
2
Rise and Fall Time, 10% to
90%
Max Output Capacitive Load
Duty Cycle
SYMBOL
F
1
F
2
DF/T
A
DF/V
DF/Yr
t
R
, t
F
C
L
t
W
/ t
10Hz
100Hz
1kHz
10kHz
100kHz
40
50
-85
-115
-129
-134
-139
(Note 6)
CONDITIONS
CMOS (Note 5)
MIN
10
-1.0
±1.0
±1.0
4
10
60
TYP
MAX
20
+1.0
UNITS
MHz
ppm
ppm/V
ppm/Yr
ns
pF
%
Phase Noise f1 Output (Note 7)
f
N
dBc/Hz
Note 5:
F
1
is the base frequency as defined by the package markings. F
2
is a programmable frequency output. The output frequency of F
2
is
derived from the base frequency, F
1
, by programming the F
2
frequency select register and duty cycle (DC) bit in the TCXO control
register. The minimum output frequency is F
1
/ (2
8
+ 1) with DC = 0 and f
1
/ [2 x (2
8
+ 1)] with DC = 1.
Note 6:
First year typical.
Note 7:
16.384MHz, 5V, +25°C with one of the two outputs enabled.
3 of 16
DS4000 Digitally Controlled TCXO
AC ELECTRICAL CHARACTERISTICS—2-WIRE SERIAL INTERFACE
(V
CC
= 4.75 to 5.25V, T
A
= -40°C to +85°C)
PARAMETER
SCL Clock Frequency
Bus Free Time Between
a STOP and START
Condition
Hold Time (Repeated)
START Condition
Low Period of SCL
Clock
High Period of SCL
Clock
Setup Time for a
Repeated START
Condition
Data Hold Time
SYMBOL
f
SCL
CONDITION
Fast mode
Standard mode
Fast mode
t
BUF
Standard mode
Fast mode (Note 7)
Standard mode (Note 7)
Fast mode
t
LOW
Standard mode
Fast mode
Standard mode
Fast mode
t
SU:STA
Standard mode
t
HD:DAT
Fast mode (Note 8)
Standard mode (Note 8)
Fast mode (Note 9)
Data Setup Time
t
SU:DAT
Standard mode (Note 9)
Rise Time of Both SDA
and SCL
Fall Time of Both SDA
and SCL
Setup Time for STOP
Condition
Capacitive Load for
Each Bus Line
Input Capacitance
250
20 + 0.1C
B
20 + 0.1C
B
20 + 0.1C
B
20 + 0.1C
B
0.6
4.0
400
5
pF
pF
300
ns
1000
300
ns
1000
ms
4.7
0
0
100
ns
0.9
0.9
MIN
0
0
1.3
4.7
0.6
4.0
1.3
4.7
0.6
4.0
0.6
ms
ms
ms
TYP
MAX
400
100
UNITS
kHz
t
HD:STA
ms
t
HIGH
ms
ms
t
R
Fast mode (Note 9)
Standard mode (Note 9)
Fast mode (Note 10)
Standard mode (Note 10)
Fast mode
Standard mode
t
F
t
SU:STO
C
B
C
I
(Note 10)
Note 7:
After this period, the first clock pulse is generated.
Note 8:
The maximum t
HD:DAT
has only to be met if the device does not stretch the LOW period (t
LOW
) of the SCL signal.
Note 9:
A fast-mode device can be used in a standard mode system, but the requirement t
SU:DAT
>250ns must then be met. This is automatically
the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the SCL
signal, it must output the next data bit to the SDA line t
RMAX
+ t
SU:DAT
(1000 + 250 = 1250ns) before the SCL line is released.
Note 10:
C
B
: Total capacitance of one bus line in pF.
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