NCD2400M
I
NTEGRATED
C
IRCUITS
D
IVISION
Features
•
DC to 150MHz frequency range
•
512-state digital programmable capacitor
•
Series or shunt configuration
C
shunt
= 12.5pF to 194pF (15.5:1 tuning ratio) in
discrete 355fF steps
C
series
= 1.7pF to 194pF in discrete 376fF steps
•
•
•
•
•
2-wire (I
2
C Fast-mode compatible) serial interface
EEPROM non-volatile memory
Wide power supply range (2.5V to 5.5V)
Operation ambient temperature to 105ºC
2 x 2 x 0.65 mm 6-pin DFN package
Wide Capacitance Range, Non-volatile
Digital Programmable Capacitor
Description
The NCD2400M is a dedicated electronic calibrator for
oscillators, with reliable performance at 105ºC as
required by OCXO applications.
This product can be used in series or shunt
configuration to support a wide variety of tuning circuit
topologies.
Digitally controlled capacitance trimming information is
communicated via a 2-wire, I
2
C Fast-mode compatible
interface. The preferred power-up default capacitance
value can be stored in the internal, re-programmable,
non-volatile memory.
Applications
•
•
•
•
•
•
OCXOs
Oscillators
Tunable RF stages
Filter tuning
Capacitive sensor trimming
Measurement equipment
Ordering Information
Part #
NCD2400MTR
Description
Standard product, Chip ID = 0x60,
DFN-6 in Tape & Reel (3000/Reel)
Special order, Contact Factory for details,
Chip ID = 0x61,
DFN-6 in Tape & Reel (3000/Reel)
NCD2400M1TR
Figure 1. NCD2400M Block Diagram
V
DD
V+
V+
NCD2400M
CP
DIGITAL
INTERFACE
AND
MEMORY
SDA
V+
C
0
SCL
CN
GND
DS-NCD2400M-R01
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NTEGRATED
C
IRCUITS
D
IVISION
NCD2400M
3
3
3
3
3
3
4
4
5
5
5
1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Package Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5 ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6 General Conditions for Electrical Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.7 Capacitor Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.8 Digital Interface: Electrical Characteristics of SDA and SCL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.9 Digital Interface: AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.10 Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Capacitive Digital to Analog Converter (CDAC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Non-Volatile Memory Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Device Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5 Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5.1 Volatile Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5.2 Non-Volatile Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6 I
2
C Serial Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6.1 Write Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6.2 Write Volatile Register Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6.3 Write Non-Volatile Memory Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6.4 Read Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6.5 Set Non-Volatile Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6.6 Electrical and Timing Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6.7 Application Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7 Capacitor Interface Electrical and Biasing Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
11
12
13
13
13
13
13
13
14
14
15
17
18
19
19
19
4. Capacitance Determination and Programming Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5. Manufacturing Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 Moisture Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 ESD Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3 Soldering Profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4 Board Wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5 Mechanical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5.1 Package Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5.2 Tape & Reel Specification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
21
21
21
21
22
22
22
2
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1. Specifications
1.1 Package Pinout
1.3 Absolute Maximum Ratings
6
NCD2400M
SDA
CP
CN
1
SCL
GND
V
DD
2
5
3
4
1.2 Pin Descriptions
Pin
1
2
3
4
5
6
Name
SDA
CP
CN
V
DD
GND
SCL
Description
Serial data I/O
Positive capacitance node
Negative capacitance node
Power supply
Ground
Serial clock input
Parameter
Supply voltage
SDA, SCL voltage
CP voltage
CN voltage
V
DD
< 3.3V
V
DD
> 3.3V
Operating temperature, T
A
Storage temperature, T
STG
Minimum Maximum Unit
-0.3
+6
V
V
DD
+ 0.3 V
-0.3
V
DD
+ 0.5 V
-0.5
-0.5
-40
-55
V
DD
+ 0.5
3.8
+105
+125
V
C
C
Absolute maximum voltages are with respect to GND.
Absolute maximum electrical ratings are over the
operating temperature range.
Absolute Maximum Ratings are stress ratings. Stresses in
excess of these ratings can cause permanent damage to
the device. Functional operation of the device at conditions
beyond those indicated in the operational sections of this
data sheet is not implied.
1.4 Recommended Operating Conditions
Parameter
Supply voltage
Capacitor voltage, CP or CN to GND
1, 2
V
DD
< 3.3V
V
DD
> 3.3V
Non-Volatile Write Programming time
3
Operating temperature
1
Symbol
V
DD
Minimum
2.5
Typical
3.3
Maximum
5.5
V
DD
+ 0.3
3.6
-
+105
Unit
V
V
CP
, V
CN
t
PNV
T
A
-0.3
-
-40
-
5
-
V
PK
ms
°C
V
PK
=V
DC
+V
AC
is the voltage applied to capacitor pins CP and CN. It should never exceed 3.6V in operation, and should never be less than
-0.3V. Sufficient DC bias must be applied to the capacitor pins to prevent the AC signal from violating this specification. Pins CP and CN are
not self biased.
2
These maximum values not to exceed the supply voltage; e.g. the maximum voltage drop between CN and GND is 2.8V when V =2.5V.
DD
3
There are three erase commands and three non-volatile write commands to program the Non-Volatile Register. This time is for each of the
three non-volatile write commands, not the sum of all three commands. The timing requirement also applies to each of the three erase
commands, not the sum of all three.
1.5 ESD Rating
Parameter
Human body model
Charge device model
Symbol
HBM
CDM
Conditions
EIA/JESD22-A114-D
JS002-2014
Rating
+2000
+500
Unit
V
R01
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1.6 General Conditions for Electrical Characteristics
NCD2400M
Typical values are the result of engineering evaluations and are characteristic of the device at 25°C with V
DD
=3.3V
and pins CP and CN biased to 1.65V
DC
. They are provided for informational purposes only and are not guaranteed by
production testing.
Unless otherwise specified, specifications cover the operating temperature range T
A
=-40ºC to +105ºC, and the supply
voltage range V
DD
= 2.5V to 5.5V.
1.7 Capacitor Electrical Characteristics
Unless otherwise noted, characteristics are at the nominal operating temperature of 25 ±5°C with the CP and CN
terminals biased at one-half of the supply voltage.
Parameter
Operating frequency range
Capacitance, Series Configuration
Minimum
Maximum
Minimum
Maximum
Capacitance, Shunt Configuration
1
Minimum
Maximum
Minimum
Maximum
Tuning ratio, Shunt Configuration
Step size, Series Configuration
Quality Factor
Test Conditions
-
f=10MHz
Code=0
Code=511
f=50MHz
Code=0
Code=511
f=10MHz
Code=0
Code=511
f=50MHz
Code=0
Code=511
C
max
/ C
min
, f=10MHz
Constant step size at f=10MHz
f=10MHz
Code=0
Code=511
f=50MHz
Code=0
Code=511
Symbol
-
C
0
C
511
C
0
C
511
C
0
C
511
C
0
C
511
-
C
step
QC
0
QC
511
QC
0
QC
511
dC/dT
Minimum
-
1.6
177.3
1.6
181.4
11.5
178.4
11.5
188.8
-
-
-
35
-
6.6
-
Typical
-
1.7
194
1.7
202.2
12.5
193.9
12.5
203.0
15.512:1
376.32
>150
95
43
18.5
250
Maximum
150
1.9
209.2
1.9
221.3
13.5
209.4
13.9
229
-
-
-
-
-
-
680
Unit
MHz
pF
-
fF
-
Capacitance variation with
temperature
1
-40°C < T
A
< +105°C, f=10MHz
ppm/°C
Shunt configuration: CP to Grounded CN
4
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1.8 Digital Interface: Electrical Characteristics of SDA and SCL
Parameter
Input voltage
Logic 1 threshold
Logic 0 threshold
Hysteresis
SDA Output voltage
1
Logic 1
Logic 0
Pull-up resistors, Internal
Load capacitance
1
NCD2400M
Test Conditions
-
-
V
IH
- V
IL
10k pull-up resistor
I
OL
= 6mA
T
A
=25°C
-40°C < T
A
< +105°C
-
Symbol
V
IH
V
IL
V
HYS
V
OH
V
OL
R
PU
C
LOAD
Minimum
0.75V
DD
-
0.1
0.95V
DD
-
111
88
Typical
-
-
-
-
-
135
135
Maximum
-
0.25V
DD
-
-
0.4
154
186
400
Unit
V
V
k
pF
SDA is an open drain pad. It is recommended to use a pull-up resistor with a value such that the current into pin SDA does not exceed 6mA,
independent of the internal pull-up resistors.
1.9 Digital Interface: AC Characteristics
Parameter
Serial clock (SCL)
Frequency
Duty cycle
Rise / fall times
Serial data (SDA)
Setup time
Rise / fall times
Data valid time
1
Non-Volatile Write Programming time
2, 3
1
2
Symbol
f
SCL
D
SCL
t
R
/ t
F
t
setup
t
R
/ t
F
t
VD,DAT
t
PNV
Minimum
-
40
-
300
-
-
4
Typical
-
-
-
-
-
-
Maximum
400
60
100
-
100
180
8
Unit
kHz
%
ns
ns
ns
ms
R
P
= 1k, C
LOAD
= 100pF
Programming time begins with the falling edge of CLK just after the CONFIG 0 ACK and ends with the rising Stop bit edge on SDA.
3
This time is for each non-volatile write commands, not the sum of all three commands.
S Chip ID + W A
CONFIG 1
A
CONFIG 0
A
WAIT
A
WAIT
A
...
WAIT
A P
Programming Time
t
R
t
F
t
setup
SDA
SCL
Stable Data Line SDA
Valid
Data
Transitions
Allowed
t
VD,DAT
Note: SDA output transitions occur only when SCL is low, as shown in the following timing diagram.
1.10 Power Supply
Parameter
Supply voltage
Supply current
Symbol
V
DD
I
DD
Minimum
2.5
-
Typical
3.3
50
Maximum
5.5
90
Unit
V
A
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