® PSoC Creator™ Component Datasheet 8-Bit Voltage Digital to Analog Converter (VDAC8) 1.70 Features Voltage output ranges: 1.020-V and 4.080-V full scale Software- or clock-driven output strobe Data source can be CPU, DMA, or UDB General Description The VDAC8 component is an 8-bit voltage output Digital to Analog Converter (DAC). The output range can be from 0 to 1.020 V (4 mV/bit) or from 0 to 4.08 V (16 mV/bit). The VDAC8 can be controlled by hardware, software, or a combination of both hardware and software. Input/Output Connections This section describes the various input and output connections for the VDAC8. An asterisk (*) in the list of I/Os indicates that the I/O may be hidden on the symbol under the conditions listed in the description of that I/O. Vout – Analog The Vout terminal is the connection to the DAC’s voltage output. It may be routed to any analogcompatible pin on the PSoC. Note The VDAC, when driven to a pin, cannot drive a value that exceeds the VDDIO for that pin. To get the result you want, set the correct VDDIO supply. data[7:0] – Input * This 8-bit-wide data signal connects the VDAC8 directly to the DAC Bus. The DAC Bus may be driven by UDB-based components or control registers, or it may be routed directly from GPIO pins. This input is enabled by setting the Data_Source parameter to DAC Bus. If the CPU or DMA option is selected instead, the bus connection will disappear from the component symbol. Use the data[7:0] input when hardware is capable of setting the proper value without CPU intervention. When using this option, the strobe option should be set as External as well. Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600 Document Number: 001-69975 Rev. *A Revised November 9, 2011 8-Bit Voltage Digital to Analog Converter (VDAC8) ® PSoC Creator™ Component Datasheet For many applications this input is not required, but instead the CPU or DMA will write a value directly to the data register. In firmware, use the VDAC8_SetValue() function or directly write a value to the VDAC8 data register. strobe – Input * The strobe input is an optional signal input and is selected with the StrobeMode parameter. If StrobeMode is set to External, the strobe pin is visible and must be connected to a valid digital source. In this mode the data is transferred from the VDAC8 register to the DAC on the next positive edge of the strobe signal. If StrobeMode is set to Register Write, the pin disappears from the symbol and any write to the data registers is immediately transferred to the DAC. For audio or periodic sampling applications, the same clock used to clock the data into the DAC can also be used to generate an interrupt. In this case, each rising edge of the clock would transfer data to the DAC and cause an interrupt to get the next value loaded into the DAC register. Page 2 of 21 Document Number: 001-69975 Rev. *A ® PSoC Creator™ Component Datasheet 8-Bit Voltage Digital to Analog Converter (VDAC8) Component Parameters Drag a VDAC8 component onto your design and double click it to open the Configure dialog. The VDAC8 component provides the following parameters. Range This parameter allows you to set one of two voltage ranges as the default value. The range may be changed at any time during runtime with the VDAC8_SetRange() function. Range Lowest Value Highest Value Step Size Range_1_Volt 0.0 mV 1.020 V 4 mV Range_4_Volt 0.0 mV 4.080 V 16 mV Output equations: 1-V range: VOUT = (value/256) × 1.024 V 4-V range: VOUT = (value/256) × 4.096 V Note The term “value” is a number between 0 and 255. Document Number: 001-69975 Rev. *A Page 3 of 21 8-Bit Voltage Digital to Analog Converter (VDAC8) ® PSoC Creator™ Component Datasheet Value This is the initial value the VDAC8 presents after the VDAC8_Start() command is executed. The VDAC8_SetValue() function or a direct write to the DAC register will override the default value at anytime. Legal values are between 0 and FF, inclusive. The mV field represents VDAC output voltage in millivolts and the 8 bit Hex field represents VDAC input data value in Hex. Speed This parameter provides two settings: Slow and Fast. In Slow mode, the settling time is slower but consumes less operating current. In Fast mode, the voltage settles much faster, but at a cost of more operating current. Data Source This parameter selects the source of the data to be written into the DAC register. If you want the CPU (firmware) or the DMA to write data to the VDAC8, select CPU or DMA (Data Bus). If you want data to be written directly from the UDBs or a UDB-based component, select DAC Bus. When DAC Bus is selected, the input is indicated on the VDAC symbol. There is only one DAC Bus, so multiple VDACs cannot have independent hardware (UDB) data sources. When Data Source is set as DAC Bus, the customizer automatically sets the Strobe Mode to External and disables the option so that you cannot change it. Note For PSoC 5 silicon, a write of a new value to the DAC may result in an indeterminate value on the DAC output. To output the desired value, write or strobe the DAC twice with the same value. Because the first write may result in an indeterminate output, the time between the two writes should be minimized. This applies to writes by CPU, DMA, and strobe. The API IDAC8_SetValue() writes the value provided twice to mitigate this issue for CPU writes. Strobe Mode This parameter selects whether the data is immediately written to the DAC when the data is written into the VDAC8 data register. This mode is enabled when the Register Write option is selected. When the External option is selected, a clock or signal from the UDBs controls when the data is written from the DAC register to the actual DAC. Page 4 of 21 Document Number: 001-69975 Rev. *A ® PSoC Creator™ Component Datasheet 8-Bit Voltage Digital to Analog Converter (VDAC8) Resources The VDAC8 component uses one viDAC8 analog block. API Memory (Bytes) Digital Blocks Analog Blocks Datapaths Macro cells Status Registers Control Registers Counter7 Flash RAM Pins (per External I/O) N/A N/A N/A N/A N/A 354 3 1 1 viDAC8 HW Application Programming Interface Application Programming Interface (API) routines allow you to configure the component using software. The following table lists and describes the interface to each function. The subsequent sections cover each function in more detail. By default, PSoC Creator assigns the instance name “VDAC8_1” to the first instance of a component in a given design. You can rename the instance to any unique value that follows the syntactic rules for identifiers. The instance name becomes the prefix of every global function name, variable, and constant symbol. For readability, the instance name used in the following table is “VDAC8.” Function Description VDAC8_Start() Initializes the VDAC8 with default customizer values. VDAC8_Stop() Disables the VDAC8 and sets it to the lowest power state. VDAC8_SetSpeed() Sets DAC speed. VDAC8_SetValue() Sets value between 0 and 255 with the given range. VDAC8_SetRange() Sets range to 1 or 4 volts. VDAC8_Sleep() Stops and saves the user configuration. VDAC8_WakeUp() Restores and enables the user configuration. VDAC8_Init() Initializes or restores default VDAC8 configuration VDAC8_Enable() Enables the VDAC8. VDAC8_SaveConfig() Saves nonretention DAC data register value. VDAC8_RestoreConfig() Restores nonretention DAC data register value Document Number: 001-69975 Rev. *A Page 5 of 21 ® 8-Bit Voltage Digital to Analog Converter (VDAC8) PSoC Creator™ Component Datasheet Global Variables Variable VDAC8_initVar Description Indicates whether the VDAC8 has been initialized. The variable is initialized to 0 and set to 1 the first time VDAC8_Start() is called. This allows the component to restart without reinitialization after the first call to the VDAC8_Start() routine. If reinitialization of the component is required, then the VDAC8_Init() function can be called before the VDAC8_Start() or VDAC8_Enable() function. void VDAC8_Start(void) Description: This is the preferred method to begin component operation. VDAC8_Start() sets the initVar variable, calls the VDAC8_Init() function, calls the VDAC8_Enable() function, and powers up the VDAC8 to the given power level. A power level of 0 is the same as executing the VDAC_Stop() function. Parameters: None Return Value: None Side Effects: If the initVar variable is already set, this function only calls the VDAC8_Enable() function. void VDAC8_Stop(void) Description: Powers down VDAC8 to lowest power state and disables output. Note This API is not recommended for use on PSoC 3 ES2 and PSoC 5 silicon. These devices have a defect that causes connections to several analog resources to be unreliable when not powered. The unreliability manifests itself in silent failures (for example, unpredictably bad results from analog components) when the component using that resource is stopped. VDAC8 components should always be powered up (by calling the VDAC8_Start() API). Do not call the VDAC8_Stop() API. Parameters: None Return Value: None Side Effects: None Page 6 of 21 Document Number: 001-69975 Rev. *A ® PSoC Creator™ Component Datasheet 8-Bit Voltage Digital to Analog Converter (VDAC8) void VDAC8_SetSpeed(uint8 speed) Description: Set DAC speed. Parameters: uint8 speed: Sets DAC speed. See the following table for valid parameters. Option Description VDAC8_LOWSPEED Low speed (low power) VDAC8_HIGHSPEED High speed (high power) Return Value: None Side Effects: None void VDAC8_SetRange(uint8 range) Description: Sets range to 1 or 4 volts. Parameters: uint8 range: Sets full-scale range for VDAC8. See the following table for ranges. Option Description VDAC8_RANGE_1V Sets full-scale range of 1.020 V VDAC8_RANGE_4V Set full-scale range of 4.080 V Return Value: None Side Effects: None void VDAC8_SetValue(uint8 value) Description: Sets value to output on VDAC8. Valid values are between 0 and 255. Parameters: uint8 value: Value between 0 and 255. A value of 0 is the lowest (zero) and a value of 255 is the full-scale value. The full-scale value is dependent on the range, which is selected with the VDAC8_SetRange() API. Return Value: None Side Effects: On PSoC 3 ES2, PSoC 3 Production, and PSoC 5 silicon, the VDAC8_SetValue() function should be called after enabling power to the VDAC. Document Number: 001-69975 Rev. *A Page 7 of 21 8-Bit Voltage Digital to Analog Converter (VDAC8) ® PSoC Creator™ Component Datasheet void VDAC8_Sleep(void) Description: This is the preferred API to prepare the component for sleep. The VDAC8_Sleep() API saves the current component state. Then it calls the VDAC8_Stop() function and calls VDAC8_SaveConfig() to save the hardware configuration. Call the VDAC8_Sleep() function before calling the CyPmSleep() or the CyPmHibernate() function. Refer to the PSoC Creator System Reference Guide for more information about power management functions. Parameters: None Return Value: None Side Effects: None void VDAC8_Wakeup(void) Description: This is the preferred API to restore the component to the state when VDAC8_Sleep() was called. The VDAC8_Wakeup() function calls the VDAC8_RestoreConfig() function to restore the configuration. If the component was enabled before the VDAC8_Sleep() function was called, the VDAC8_Wakeup() function will also re-enable the component. Parameters: None Return Value: None Side Effects: Calling the VDAC8_Wakeup() function without first calling the VDAC8_Sleep() or VDAC8_SaveConfig() function may produce unexpected behavior. void VDAC8_Init(void) Description: Initializes or restores the component according to the customizer Configure dialog settings. It is not necessary to call VDAC8_Init() because the VDAC8_Start() API calls this function and is the preferred method to begin component operation. Parameters: None Return Value: None Side Effects: All registers will be set to their initial values. This will reinitialize the component. Calling the VDAC8_Init() function requires a call to VDAC8_SetValue() if you intend to set a new value other than what is currently in the register. Page 8 of 21 Document Number: 001-69975 Rev. *A ® PSoC Creator™ Component Datasheet 8-Bit Voltage Digital to Analog Converter (VDAC8) void VDAC8_Enable(void) Description: Activates the hardware and begins component operation. It is not necessary to call VDAC8_Enable() because the VDAC8_Start() API calls this function, which is the preferred method to begin component operation. Parameters: None Return Value: None Side Effects: None void VDAC8_SaveConfig(void) Description: This function saves the component configuration and nonretention registers. This function will also save the current component parameter values, as defined in the Configure dialog or as modified by appropriate APIs. This function is called by the VDAC8_Sleep() function. Parameters: None Return Value: None Side Effects: None void VDAC8_RestoreConfig(void) Description: This function restores the component configuration and nonretention registers. This function will also restore the component parameter values to what they were before calling the VDAC8_Sleep() function. Parameters: None Return Value: None Side Effects: Calling this function before calling VDAC_Sleep() may result in unexpected behavior. DMA Wizard VDAC8 components do not require implementation of a DMA Request signal. The typical usage is signal generation. The data rate to VDAC8 components should be controlled externally. You can use the DMA Wizard to configure DMA operation as follows: Name of DMA Source/Destination in DMA Wizard VDAC8_Data_PTR Direction DMA Req Signal Destination N/A Document Number: 001-69975 Rev. *A DMA Req Type N/A Description Stores the DAC value between 0 and 255 Page 9 of 21 8-Bit Voltage Digital to Analog Converter (VDAC8) ® PSoC Creator™ Component Datasheet Sample Firmware Source Code PSoC Creator provides many example projects that include schematics and example code in the Find Example Project dialog. For component-specific examples, open the dialog from the Component Catalog or an instance of the component in a schematic. For general examples, open the dialog from the Start Page or File menu. As needed, use the Filter Options in the dialog to narrow the list of projects available to select. Refer to the “Find Example Project” topic in the PSoC Creator Help for more information. Functional Description When used as a VDAC8, the viDAC8 analog block is configured as voltage DAC and can be used as voltage source. When used as a VDAC, the output is an 8-bit digital-to-analog conversion voltage to support applications that need reference voltages. In this case, the reference source is a voltage reference from the Analog reference block called VREF(DAC). You can configure the DAC to work in voltage mode by setting the DACx_CR0 [4] register. In this mode, there are two output ranges selected by the DACx_CR0[3:2] register: 0 V to 1.024 V 0 V to 4.096 V Both output ranges have 255 equal steps. The VDAC is implemented by driving the output of the current DAC through resistors and obtaining a voltage output. Because no buffer is used, any DC current drawn from the DAC affects the output level. Therefore, in this mode any load connected to the output should be capacitive. The VDAC can convert up to 1 Msps. Also, the DAC is slower in 4-V mode than 1-V mode, because the resistive load to VSSA is four times larger. In 4-V mode, the VDAC can convert up to 250 ksps. Page 10 of 21 Document Number: 001-69975 Rev. *A ® PSoC Creator™ Component Datasheet 8-Bit Voltage Digital to Analog Converter (VDAC8) Block Diagram and Configuration Figure 1 shows the block diagram for the VDAC8 component. Figure 1. VDAC8 Block Diagram VDDA VCC(Regulated) DAC Value Mirror 1x, 2x ... 255x (8 bit) Calibration Mirror 1.024V Output ISOURCE VOUT R Reference Current Source Scaler R 3R Registers The functions provided with the component support most of the common runtime functions that most applications require. The following register references provide brief descriptions for the advanced user. The VDAC8_Data register may be used to write data directly to the DAC without using an API. This can be useful for either the CPU or DMA. VDAC8_CR0 Bits 7 6 Value 5 RSVD 4 3 mode 2 Range[1:0] 1 0 hs RSVD mode: Sets DAC to either voltage or current mode Range[1:0]: DAC range settings hs: Sets data speed VDAC8_CR1 Bits Value 7 6 RSVD 5 4 3 2 1 0 mx_data reset_udb_e n mx_idir idirbit Mx_ioff ioffbit mx_data: Selects data source Document Number: 001-69975 Rev. *A Page 11 of 21 ® 8-Bit Voltage Digital to Analog Converter (VDAC8) PSoC Creator™ Component Datasheet reset_udb_en: DAC reset enable mx_idir: Mux selection for DAC current direction control idirbit: Register source for DAC current direction mx_off: Mux selection for DAC current off control ioffbit: Register source for DAC current off VDAC8_DATA Bits 7 6 5 4 Value 3 2 1 0 Data[7:0] Data[7:0]: DAC data register DC and AC Electrical Characteristics for PSoC 3 The following values are based on characterization data. Specifications are valid for –40°C £ TA £ 85 °C and TJ £ 100 °C except where noted. Unless otherwise specified in the tables below, all Typical values are for T A = 25 °C, VDDA = 5.0 V, output referenced to analog ground (VSSA), fast mode. VDAC8 DC Electrical Characteristics Parameter Description Conditions Resolution Typ Max Units – 8 – bits INL1 Integral nonlinearity 1-V scale – ±2.1 ±2.5 LSB DNL1 Differential nonlinearity 1-V scale – ±0.3 ±1 LSB ROUT Output resistance 1-V scale – 4 – k 4-V scale – 16 – k 1-V scale – 1 – V 4-V scale, VDDA = 5 V – 4 1 – V Monotonicity – – Yes – VOS Zero-scale error – 0 ±0.9 LSB FSGainErr Full-scale gain error 1-V scale – ±1.6 ±2.5 % 4-V scale – ±1.5 ±2.5 % VOUT 1 Min Output voltage range, code = 255 For VDDA voltage below 5 V, the output only complies to specifications for output voltages below (V DDA – 1 V). Page 12 of 21 Document Number: 001-69975 Rev. *A ® PSoC Creator™ Component Datasheet Parameter 8-Bit Voltage Digital to Analog Converter (VDAC8) Description TCGainErr IDD Conditions Min Typ Max Units Temperature coefficient, gain error 1-V scale – – 0.02 %FSR/°C 4-V scale – – 0.02 %FSR/°C Operating current Slow mode – – 100 µA Fast mode – – 500 µA Figures INL versus DAC Code, 1.0-V Range INL versus DAC Code, 4.0-V Range 0.8 0.8 0.6 0.6 0.4 0.4 0.2 0.2 Bits 1 Bits 1 0 0 -0.2 -0.2 -0.4 -0.4 -0.6 -0.6 -0.8 1V INL -1 0 32 64 96 128 160 Code 192 224 -0.8 0 0.2 0.2 0.15 0.15 0.1 0.1 0.05 0.05 Bits 0 -0.05 -0.1 -0.1 1V DNL -0.2 0 32 64 96 128 160 Code Document Number: 001-69975 Rev. *A 192 64 96 128 160 Code 192 224 256 0 -0.05 -0.15 32 DNL versus DAC Code, 4.0-V Range Bits Typical DNL versus DAC Code, 1.0-V Range 4V INL -1 256 224 256 -0.15 4V DNL -0.2 0 32 64 96 128 160 Code 192 224 256 Page 13 of 21 ® 8-Bit Voltage Digital to Analog Converter (VDAC8) PSoC Creator™ Component Datasheet VDAC INL versus Temperature, 1-V Mode VDAC DNL versus Temperature, 1-V Mode 3.0 1.0 0.9 2.5 0.8 0.7 DNL, LSB INL, LSB 2.0 1.5 1.0 0.6 0.5 0.4 0.3 0.2 0.5 0.1 0.0 0.0 -40 -20 0 20 40 60 80 -40 -20 0 Temperature, °C 40 60 80 VDAC Full Scale Error versus Temperature, 4-V Mode 1.0 1.0 0.8 0.8 0.6 0.6 Full Scale Error, % Full Scale Error, % VDAC Full Scale Error versus Temperature, 1-V Mode 0.4 0.2 0.0 -0.2 -0.4 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.6 -0.8 -0.8 -1.0 -1.0 -40 -20 0 20 40 60 80 -40 -20 0 20 Temperature, °C 400 90 350 Operating Current. µA 80 70 60 Max, Vdda = 5.5 V 40 Max, Vdda = 2.7 V 30 60 80 VDAC Operating Current versus Temperature, 1-V Mode, Fast Mode 100 50 40 Temperature, °C VDAC Operating Current versus Temperature, 1-V Mode, Slow Mode Operating Current. µA 20 Temperature, °C 20 Max, Vdda = 5.5 V 300 250 200 150 100 50 10 0 0 -40 -20 0 20 40 Temperature, °C Page 14 of 21 60 80 -40 -20 0 20 40 60 80 Temperature, °C Document Number: 001-69975 Rev. *A ® PSoC Creator™ Component Datasheet 8-Bit Voltage Digital to Analog Converter (VDAC8) VDAC8 AC Electrical Characteristics Parameter FDAC Description Conditions Min Typ Max 1-V scale – – 1000 ksps 4-V scale – – 250 ksps Settling time to 0.1%, step 25% to 75% 1-V scale, CLOAD = 15 pF – 0.45 1 µs 4-V scale, CLOAD = 15 pF – 0.8 3.2 µs Settling time to 0.1%, step 75% to 25% 1-V scale, CLOAD = 15 pF – 0.45 1 µs 4-V scale, CLOAD = 15 pF – 0.7 3 µs Slew rate, step 10% to 90% 1-V scale, CLOAD = 15 pF – 0.3 0.5 µs 4-V scale, CLOAD = 15 pF – 0.5 1.3 µs 1-V scale, CLOAD = 15 pF – 0.3 0.5 µs 4-V scale, CLOAD = 15 pF – 0.3 1.3 µs 2 4-V scale, code 255 – 3 – µV/rtHz 2 1-V scale, code 255 – 750 – nV/rtHz Update rate TsettleP TsettleN SRP SRN Slew rate, step 90% to 10% Vn4V Noise density Vn1V Noise density Units Figures Noise Levels, Scale 4 V Noise Levels, Scale 1 V 100000 Scale = 4 V, Code = 255 Scale = 4 V, Code = 64 100000 10000 10000 nV/rtHz nV/rtHz 1000 1000 100 100 Voltage Noise proportional to Scale * Code Voltage Noise proportional to Scale * Code 10 0.01 2 Scale = 1 V, Code = 255 Scale = 1 V, Code = 64 0.1 1 kHz 10 100 1000 10 0.01 0.1 1 kHz 10 100 1000 Output noise is directly proportional to code value. Document Number: 001-69975 Rev. *A Page 15 of 21 ® 8-Bit Voltage Digital to Analog Converter (VDAC8) PSoC Creator™ Component Datasheet DC and AC Electrical Characteristics for PSoC 5 The following values are based on characterization data. Specifications are valid for –40°C £ TA £ 85 °C and TJ £ 100 °C, except where noted. Unless otherwise specified in the following tables, all Typical values are for T A = 25 °C, VDDA = 5.0 V, output referenced to analog ground (VSSA), fast mode. VDAC8 DC Electrical Characteristics Parameter Description Conditions Resolution Typ Max Units – 8 – bits INL1 Integral nonlinearity 1-V scale – ±2.1 ±2.5 LSB DNL1 Differential nonlinearity 1-V scale – ±0.3 ±1 LSB ROUT Output resistance 1-V scale – 4 – k 4-V scale – 16 – k 1-V scale – 1.02 – V 4-V scale, VDDA = 5 V – 4.08 – V Monotonicity – – Yes – VOS Zero-scale error – 0 ±0.9 LSB Eg Gain error 1-V scale – – ±5 % 4-V scale – – ±5 % Temperature coefficient, gain error 1-V scale – – 0.03 %FSR/°C 4-V scale – – 0.03 %FSR/°C Operating current 4-V Slow mode – – 100 µA 4-V Fast mode – – 500 µA 1-V Slow mode 300 µA 1-V Fast mode 600 µA VOUT TC_Eg IDD 3 Min Output voltage range, code = 255 3 For VDDA voltage below 5 V, the output only complies to specifications for output voltages below (V DDA – 1 V). Page 16 of 21 Document Number: 001-69975 Rev. *A ® PSoC Creator™ Component Datasheet 8-Bit Voltage Digital to Analog Converter (VDAC8) Figures VDAC DNL versus Input Code, 1-V Mode 1 1 0.5 0.5 DNL, LSB INL, LSB VDAC INL versus Input Code, 1-V Mode 0 -0.5 0 -0.5 -1 0 32 64 96 128 160 192 224 -1 256 0 32 64 96 Code, 8-bit 128 160 192 224 256 Code, 8-bit VDAC INL versus Temperature, 1-V Mode VDAC DNL versus Temperature, 1-V Mode 1 0.2 DNL, LSB INL, LSB 0.5 0 0.1 -0.5 -1 -40 -20 0 20 40 Temperature, °C 60 80 -40 VDAC Full Scale Error versus Temperature, 1-V Mode 2 2 1.5 1.5 1 1 0.5 0 -0.5 -1 -1.5 -20 0 20 40 Temperature, °C 60 80 VDAC Full Scale Error versus Temperature, 4-V Mode Full Scale Error, % Full Scale Error, % 0 0.5 0 -0.5 -1 -1.5 -2 -40 -20 0 20 40 Temperature, °C Document Number: 001-69975 Rev. *A 60 80 -2 -40 -20 0 20 40 Temperature, °C 60 80 Page 17 of 21 ® 8-Bit Voltage Digital to Analog Converter (VDAC8) PSoC Creator™ Component Datasheet VDAC Operating Current versus Temperature, 1-V Mode, Fast Mode 500 500 400 400 Operating Current, µA Operating Current, µA VDAC Operating Current versus Temperature, 1-V Mode, Slow Mode 300 200 100 0 300 200 100 0 -40 -20 0 20 40 Temperature, °C 60 80 -40 -20 0 20 40 Temperature, °C 60 80 VDAC8 AC Electrical Characteristics Parameter FDAC TsettleP TsettleN Page 18 of 21 Description Min Typ Max 1-V scale – – 1000 ksps 4-V scale – – 250 ksps Settling time to 0.1%, step 25% to 75% 1-V scale, CLOAD = 15 pF – 0.45 1 µs 4-V scale, CLOAD = 15 pF – 0.8 4 µs Settling time to 0.1%, step 75% to 25% 1-V scale, CLOAD = 15 pF – 0.45 1 µs 4-V scale, CLOAD = 15 pF – 0.7 4 µs Voltage Noise Range = 1 V, fast mode, VDDA = 5 V, 10 kHz – 750 – nVsqrtHz Update rate Conditions Units Document Number: 001-69975 Rev. *A ® PSoC Creator™ Component Datasheet 8-Bit Voltage Digital to Analog Converter (VDAC8) Figures VDAC Step Response, Codes 0x40 to 0xC0, 1-V Mode, Fast Mode, VDDA = 5 V VDAC Glitch Response, Codes 0x7F to 0x80, 1-V Mode, Fast Mode, VDDA = 5 V 0.9 0.56 0.8 0.7 0.54 0.5 Vout, V Vout, V 0.6 0.4 0.52 0.3 0.50 0.2 0.1 0.0 0.48 0 1 2 3 4 5 Time, µs 0 1 2 3 4 5 Time, µs VDAC PSRR versus Frequency 40 PSRR, dB 30 20 4 V, code 0x7F 10 4 V, code 0xFF 0 0.1 1 10 100 1000 Frequency, kHz Terminology Integral Nonlinearity (INL) INL, integral nonlinearity, is a measure of the maximum deviation, in LSBs, from a best fit straight line over the operating range of the DAC. Differential Nonlinearity (DNL) DNL, differential nonlinearity, is the difference between the measured change and the ideal 1-LSB change between any two adjacent codes. This VDAC is guaranteed monotonic by design. The output is “thermometer-encoded;” each successive step is made by turning on a separate output source which is summed with previously enabled output sources. Document Number: 001-69975 Rev. *A Page 19 of 21 8-Bit Voltage Digital to Analog Converter (VDAC8) ® PSoC Creator™ Component Datasheet Montonicity A DAC is defined as monotonic if the output increases or stays the same with each increasing digital code input value. The VDAC8 component is monotonic over the full operating range of voltage and temperature. Zero-Scale Error Zero-scale error is the difference between the measured value at code 0x00 and the value of the best-fit straight line at code 0x00. Full-Scale Gain Error Full-scale gain error is the difference between the measured value and the nominal value at maximum code. The maximum value is either 1.020 V or 4.080 V at code = 255 (0x00). Full-Scale Gain Temperature Coefficient (TC) Full-scale gain temperature coefficient is the change in full-scale value (maximum code 0xFF) with change in temperature. Gain changes at lower values are proportional to code value. Power Supply Rejection Ratio (PSRR) Power supply rejection ratio measures the isolation of the VDAC's output from the power supply. Settling Time Settling time is the amount of time required for the output to settle to a specific level for a specific digital input change. Slew Rate The slew rate is the maximum rate of change of the output of the VDAC. Slew rate is measured from 10 percent to 90 percent of full-scale value Glitch Amplitude Glitch amplitude is the peak amplitude of the pulse injected into the output when the input code changes a single count at mid-scale (0x7F to 0x80). The pulse is greater than the difference between the static values before and after data change. Voltage Noise Voltage noise is the sum of the noise of the VDAC's output resistance and the current output noise times the output resistance of the VDAC. This noise varies as a function of code value. Page 20 of 21 Document Number: 001-69975 Rev. *A ® PSoC Creator™ Component Datasheet 8-Bit Voltage Digital to Analog Converter (VDAC8) Component Changes This section lists the major changes in the component from the previous version. Version 1.70.a Description of Changes Reason for Changes / Impact Added DC and AC Electrical characteristics data for PSoC 5 Minor datasheet edits and updates 1.70 1.60 VDAC8_Stop() API modified for PSoC 5 Change required to prevent the component from impacting unrelated analog signals when stopped, when using PSoC 5. Updated VDAC customizer. To make VDAC layout same as IDAC layout. To force the Strobe mode to External when Data Source is selected as DAC Bus. Added a GUI Configuration Editor Previous configuration window did not provide enough information for ease of use. Added characterization data to datasheet Minor datasheet edits and updates 1.50 Added Sleep/Wakeup and Init/Enable APIs. To support low-power modes, and to provide common interfaces to separate control of initialization and enabling of most components. Added DMA capabilities file to the component. This file allows the VDAC8 to be supported by the DMA Wizard tool in PSoC Creator. © Cypress Semiconductor Corporation, 2011. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress products in lifesupport systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges. PSoC® is a registered trademark, and PSoC Creator™ and Programmable System-on-Chip™ are trademarks of Cypress Semiconductor Corp. All other trademarks or registered trademarks referenced herein are property of the respective corporations. Any Source Code (software and/or firmware) is owned by Cypress Semiconductor Corporation (Cypress) and is protected by and subject to worldwide patent protection (United States and foreign), United States copyright laws and international treaty provisions. Cypress hereby grants to licensee a personal, non-exclusive, non-transferable license to copy, use, modify, create derivative works of, and compile the Cypress Source Code and derivative works for the sole purpose of creating custom software and or firmware in support of licensee product to be used only in conjunction with a Cypress integrated circuit as specified in the applicable agreement. Any reproduction, modification, translation, compilation, or representation of this Source Code except as specified above is prohibited without the express written permission of Cypress. Disclaimer: CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress reserves the right to make changes without further notice to the materials described herein. Cypress does not assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in lifesupport systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress’ product in a life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges. Use may be limited by and subject to the applicable Cypress software license agreement. Document Number: 001-69975 Rev. *A Page 21 of 21